mirror of
git://c9x.me/qbe.git
synced 2024-11-22 17:37:34 +01:00
skip preludes for some leaf fns
When rbp is not necessary to compile a leaf function, we skip saving and restoring it.
This commit is contained in:
Quentin Carbonneaux
parent
bb8de8c633
commit
626f0b2781
4 changed files with 145 additions and 98 deletions
2
all.h
2
all.h
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@ -393,8 +393,10 @@ struct Fn {
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Blk **rpo;
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bits reg;
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int slot;
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int salign;
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char vararg;
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char dynalloc;
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char leaf;
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char name[NString];
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Lnk lnk;
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};
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234
amd64/emit.c
234
amd64/emit.c
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@ -1,6 +1,16 @@
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#include "all.h"
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typedef struct E E;
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struct E {
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FILE *f;
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Fn *fn;
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int fp;
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uint64_t fsz;
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int nclob;
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};
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#define CMP(X) \
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X(Ciule, "be") \
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X(Ciult, "b") \
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@ -142,23 +152,29 @@ static char *rname[][4] = {
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static int
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slot(Ref r, Fn *fn)
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slot(Ref r, E *e)
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{
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int s;
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s = rsval(r);
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assert(s <= fn->slot);
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assert(s <= e->fn->slot);
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/* specific to NAlign == 3 */
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if (s < 0)
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return -4 * s;
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else if (fn->vararg)
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return -176 + -4 * (fn->slot - s);
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if (s < 0) {
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if (e->fp == RSP)
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return 4*-s - 8 + e->fsz + e->nclob*8;
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else
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return -4 * (fn->slot - s);
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return 4*-s;
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}
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else if (e->fp == RSP)
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return 4*s + e->nclob*8;
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else if (e->fn->vararg)
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return -176 + -4 * (e->fn->slot - s);
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else
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return -4 * (e->fn->slot - s);
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}
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static void
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emitcon(Con *con, FILE *f)
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emitcon(Con *con, E *e)
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{
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char *p, *l;
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@ -168,16 +184,16 @@ emitcon(Con *con, FILE *f)
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p = l[0] == '"' ? "" : T.assym;
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if (con->sym.type == SThr) {
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if (T.apple)
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fprintf(f, "%s%s@TLVP", p, l);
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fprintf(e->f, "%s%s@TLVP", p, l);
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else
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fprintf(f, "%%fs:%s%s@tpoff", p, l);
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fprintf(e->f, "%%fs:%s%s@tpoff", p, l);
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} else
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fprintf(f, "%s%s", p, l);
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fprintf(e->f, "%s%s", p, l);
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if (con->bits.i)
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fprintf(f, "%+"PRId64, con->bits.i);
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fprintf(e->f, "%+"PRId64, con->bits.i);
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break;
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case CBits:
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fprintf(f, "%"PRId64, con->bits.i);
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fprintf(e->f, "%"PRId64, con->bits.i);
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break;
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default:
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die("unreachable");
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@ -212,10 +228,10 @@ getarg(char c, Ins *i)
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}
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}
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static void emitins(Ins, Fn *, FILE *);
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static void emitins(Ins, E *);
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static void
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emitcopy(Ref r1, Ref r2, int k, Fn *fn, FILE *f)
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emitcopy(Ref r1, Ref r2, int k, E *e)
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{
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Ins icp;
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@ -223,11 +239,11 @@ emitcopy(Ref r1, Ref r2, int k, Fn *fn, FILE *f)
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icp.arg[0] = r2;
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icp.to = r1;
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icp.cls = k;
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emitins(icp, fn, f);
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emitins(icp, e);
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}
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static void
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emitf(char *s, Ins *i, Fn *fn, FILE *f)
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emitf(char *s, Ins *i, E *e)
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{
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static char clstoa[][3] = {"l", "q", "ss", "sd"};
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char c;
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@ -247,25 +263,25 @@ emitf(char *s, Ins *i, Fn *fn, FILE *f)
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case '-':
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assert((!req(i->arg[1], i->to) || req(i->arg[0], i->to)) &&
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"cannot convert to 2-address");
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emitcopy(i->to, i->arg[0], i->cls, fn, f);
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emitcopy(i->to, i->arg[0], i->cls, e);
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s++;
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break;
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}
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fputc('\t', f);
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fputc('\t', e->f);
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Next:
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while ((c = *s++) != '%')
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if (!c) {
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fputc('\n', f);
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fputc('\n', e->f);
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return;
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} else
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fputc(c, f);
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fputc(c, e->f);
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switch ((c = *s++)) {
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case '%':
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fputc('%', f);
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fputc('%', e->f);
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break;
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case 'k':
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fputs(clstoa[i->cls], f);
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fputs(clstoa[i->cls], e->f);
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break;
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case '0':
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case '1':
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@ -282,37 +298,42 @@ Next:
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switch (rtype(ref)) {
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case RTmp:
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assert(isreg(ref));
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fprintf(f, "%%%s", regtoa(ref.val, sz));
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fprintf(e->f, "%%%s", regtoa(ref.val, sz));
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break;
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case RSlot:
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fprintf(f, "%d(%%rbp)", slot(ref, fn));
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fprintf(e->f, "%d(%%%s)",
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slot(ref, e),
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regtoa(e->fp, SLong)
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);
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break;
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case RMem:
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Mem:
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m = &fn->mem[ref.val];
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m = &e->fn->mem[ref.val];
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if (rtype(m->base) == RSlot) {
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off.type = CBits;
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off.bits.i = slot(m->base, fn);
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off.bits.i = slot(m->base, e);
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addcon(&m->offset, &off, 1);
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m->base = TMP(RBP);
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m->base = TMP(e->fp);
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}
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if (m->offset.type != CUndef)
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emitcon(&m->offset, f);
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fputc('(', f);
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emitcon(&m->offset, e);
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fputc('(', e->f);
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if (!req(m->base, R))
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fprintf(f, "%%%s", regtoa(m->base.val, SLong));
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fprintf(e->f, "%%%s",
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regtoa(m->base.val, SLong)
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);
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else if (m->offset.type == CAddr)
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fprintf(f, "%%rip");
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fprintf(e->f, "%%rip");
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if (!req(m->index, R))
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fprintf(f, ", %%%s, %d",
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fprintf(e->f, ", %%%s, %d",
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regtoa(m->index.val, SLong),
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m->scale
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);
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fputc(')', f);
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fputc(')', e->f);
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break;
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case RCon:
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fputc('$', f);
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emitcon(&fn->con[ref.val], f);
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fputc('$', e->f);
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emitcon(&e->fn->con[ref.val], e);
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break;
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default:
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die("unreachable");
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@ -337,18 +358,21 @@ Next:
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case RMem:
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goto Mem;
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case RSlot:
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fprintf(f, "%d(%%rbp)", slot(ref, fn));
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fprintf(e->f, "%d(%%%s)",
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slot(ref, e),
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regtoa(e->fp, SLong)
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);
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break;
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case RCon:
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off = fn->con[ref.val];
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emitcon(&off, f);
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off = e->fn->con[ref.val];
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emitcon(&off, e);
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if (off.type == CAddr)
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if (off.sym.type != SThr || T.apple)
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fprintf(f, "(%%rip)");
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fprintf(e->f, "(%%rip)");
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break;
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case RTmp:
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assert(isreg(ref));
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fprintf(f, "(%%%s)", regtoa(ref.val, SLong));
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fprintf(e->f, "(%%%s)", regtoa(ref.val, SLong));
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break;
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default:
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die("unreachable");
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@ -366,7 +390,7 @@ static void *negmask[4] = {
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};
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static void
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emitins(Ins i, Fn *fn, FILE *f)
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emitins(Ins i, E *e)
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{
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Ref r;
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int64_t val;
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@ -393,7 +417,7 @@ emitins(Ins i, Fn *fn, FILE *f)
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|| (omap[o].cls == Ka))
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break;
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}
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emitf(omap[o].fmt, &i, fn, f);
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emitf(omap[o].fmt, &i, e);
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break;
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case Onop:
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/* just do nothing for nops, they are inserted
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@ -410,7 +434,7 @@ emitins(Ins i, Fn *fn, FILE *f)
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if (KBASE(i.cls) == 0 /* only available for ints */
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&& rtype(i.arg[0]) == RCon
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&& rtype(i.arg[1]) == RTmp) {
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emitf("imul%k %0, %1, %=", &i, fn, f);
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emitf("imul%k %0, %1, %=", &i, e);
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break;
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}
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goto Table;
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@ -419,18 +443,18 @@ emitins(Ins i, Fn *fn, FILE *f)
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* some 3-address subtractions */
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if (req(i.to, i.arg[1]) && !req(i.arg[0], i.to)) {
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ineg = (Ins){Oneg, i.cls, i.to, {i.to}};
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emitins(ineg, fn, f);
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emitf("add%k %0, %=", &i, fn, f);
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emitins(ineg, e);
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emitf("add%k %0, %=", &i, e);
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break;
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}
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goto Table;
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case Oneg:
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if (!req(i.to, i.arg[0]))
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emitf("mov%k %0, %=", &i, fn, f);
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emitf("mov%k %0, %=", &i, e);
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if (KBASE(i.cls) == 0)
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emitf("neg%k %=", &i, fn, f);
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emitf("neg%k %=", &i, e);
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else
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fprintf(f,
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fprintf(e->f,
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"\txorp%c %sfp%d(%%rip), %%%s\n",
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"xxsd"[i.cls],
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T.asloc,
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@ -443,8 +467,8 @@ emitins(Ins i, Fn *fn, FILE *f)
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* conversion to 2-address in emitf() would fail */
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if (req(i.to, i.arg[1])) {
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i.arg[1] = TMP(XMM0+15);
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emitf("mov%k %=, %1", &i, fn, f);
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emitf("mov%k %0, %=", &i, fn, f);
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emitf("mov%k %=, %1", &i, e);
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emitf("mov%k %0, %=", &i, e);
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i.arg[0] = i.to;
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}
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goto Table;
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@ -460,53 +484,54 @@ emitins(Ins i, Fn *fn, FILE *f)
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t0 = rtype(i.arg[0]);
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if (i.cls == Kl
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&& t0 == RCon
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&& fn->con[i.arg[0].val].type == CBits) {
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val = fn->con[i.arg[0].val].bits.i;
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&& e->fn->con[i.arg[0].val].type == CBits) {
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val = e->fn->con[i.arg[0].val].bits.i;
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if (isreg(i.to))
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if (val >= 0 && val <= UINT32_MAX) {
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emitf("movl %W0, %W=", &i, fn, f);
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emitf("movl %W0, %W=", &i, e);
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break;
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}
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if (rtype(i.to) == RSlot)
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if (val < INT32_MIN || val > INT32_MAX) {
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emitf("movl %0, %=", &i, fn, f);
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emitf("movl %0>>32, 4+%=", &i, fn, f);
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emitf("movl %0, %=", &i, e);
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emitf("movl %0>>32, 4+%=", &i, e);
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break;
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}
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}
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if (isreg(i.to)
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&& t0 == RCon
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&& fn->con[i.arg[0].val].type == CAddr) {
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emitf("lea%k %M0, %=", &i, fn, f);
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&& e->fn->con[i.arg[0].val].type == CAddr) {
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emitf("lea%k %M0, %=", &i, e);
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break;
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}
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if (rtype(i.to) == RSlot
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&& (t0 == RSlot || t0 == RMem)) {
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i.cls = KWIDE(i.cls) ? Kd : Ks;
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i.arg[1] = TMP(XMM0+15);
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emitf("mov%k %0, %1", &i, fn, f);
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emitf("mov%k %1, %=", &i, fn, f);
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emitf("mov%k %0, %1", &i, e);
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emitf("mov%k %1, %=", &i, e);
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break;
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}
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/* conveniently, the assembler knows if it
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* should use movabsq when reading movq */
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emitf("mov%k %0, %=", &i, fn, f);
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emitf("mov%k %0, %=", &i, e);
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break;
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case Oaddr:
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if (!T.apple
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&& rtype(i.arg[0]) == RCon
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&& fn->con[i.arg[0].val].sym.type == SThr) {
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&& e->fn->con[i.arg[0].val].sym.type == SThr) {
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/* derive the symbol address from the TCB
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* address at offset 0 of %fs */
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assert(isreg(i.to));
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con = &fn->con[i.arg[0].val];
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con = &e->fn->con[i.arg[0].val];
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sym = str(con->sym.id);
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emitf("movq %%fs:0, %L=", &i, fn, f);
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fprintf(f, "\tleaq %s%s@tpoff",
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emitf("movq %%fs:0, %L=", &i, e);
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fprintf(e->f, "\tleaq %s%s@tpoff",
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sym[0] == '"' ? "" : T.assym, sym);
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if (con->bits.i)
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fprintf(f, "%+"PRId64, con->bits.i);
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fprintf(f, "(%%%s), %%%s\n",
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fprintf(e->f, "%+"PRId64,
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con->bits.i);
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fprintf(e->f, "(%%%s), %%%s\n",
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regtoa(i.to.val, SLong),
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regtoa(i.to.val, SLong));
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break;
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@ -517,12 +542,12 @@ emitins(Ins i, Fn *fn, FILE *f)
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* assembly... */
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switch (rtype(i.arg[0])) {
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case RCon:
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fprintf(f, "\tcallq ");
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emitcon(&fn->con[i.arg[0].val], f);
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fprintf(f, "\n");
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fprintf(e->f, "\tcallq ");
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emitcon(&e->fn->con[i.arg[0].val], e);
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fprintf(e->f, "\n");
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break;
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case RTmp:
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emitf("callq *%L0", &i, fn, f);
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emitf("callq *%L0", &i, e);
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break;
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default:
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die("invalid call argument");
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@ -533,9 +558,10 @@ emitins(Ins i, Fn *fn, FILE *f)
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* maybe we should split Osalloc in 2 different
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* instructions depending on the result
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*/
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emitf("subq %L0, %%rsp", &i, fn, f);
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assert(e->fp == RBP);
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emitf("subq %L0, %%rsp", &i, e);
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if (!req(i.to, R))
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emitcopy(i.to, TMP(RSP), Kl, fn, f);
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emitcopy(i.to, TMP(RSP), Kl, e);
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break;
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case Oswap:
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if (KBASE(i.cls) == 0)
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@ -543,27 +569,35 @@ emitins(Ins i, Fn *fn, FILE *f)
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/* for floats, there is no swap instruction
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* so we use xmm15 as a temporary
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*/
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emitcopy(TMP(XMM0+15), i.arg[0], i.cls, fn, f);
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emitcopy(i.arg[0], i.arg[1], i.cls, fn, f);
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emitcopy(i.arg[1], TMP(XMM0+15), i.cls, fn, f);
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emitcopy(TMP(XMM0+15), i.arg[0], i.cls, e);
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emitcopy(i.arg[0], i.arg[1], i.cls, e);
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emitcopy(i.arg[1], TMP(XMM0+15), i.cls, e);
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break;
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case Odbgloc:
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emitdbgloc(i.arg[0].val, i.arg[1].val, f);
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emitdbgloc(i.arg[0].val, i.arg[1].val, e->f);
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break;
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}
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}
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static uint64_t
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framesz(Fn *fn)
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static void
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framesz(E *e)
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{
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uint64_t i, o, f;
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/* specific to NAlign == 3 */
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o = 0;
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||||
if (!e->fn->leaf) {
|
||||
for (i=0, o=0; i<NCLR; i++)
|
||||
o ^= 1 & (fn->reg >> amd64_sysv_rclob[i]);
|
||||
f = fn->slot;
|
||||
o ^= e->fn->reg >> amd64_sysv_rclob[i];
|
||||
o &= 1;
|
||||
}
|
||||
f = e->fn->slot;
|
||||
f = (f + 3) & -4;
|
||||
return 4*f + 8*o + 176*fn->vararg;
|
||||
if (f > 0
|
||||
&& e->fp == RSP
|
||||
&& e->fn->salign == 4)
|
||||
f += 2;
|
||||
e->fsz = 4*f + 8*o + 176*e->fn->vararg;
|
||||
}
|
||||
|
||||
void
|
||||
|
|
@ -578,13 +612,19 @@ amd64_emitfn(Fn *fn, FILE *f)
|
|||
Blk *b, *s;
|
||||
Ins *i, itmp;
|
||||
int *r, c, o, n, lbl;
|
||||
uint64_t fs;
|
||||
E *e;
|
||||
|
||||
e = &(E){.f = f, .fn = fn};
|
||||
emitfnlnk(fn->name, &fn->lnk, f);
|
||||
fputs("\tendbr64\n\tpushq %rbp\n\tmovq %rsp, %rbp\n", f);
|
||||
fs = framesz(fn);
|
||||
if (fs)
|
||||
fprintf(f, "\tsubq $%"PRIu64", %%rsp\n", fs);
|
||||
fputs("\tendbr64\n", f);
|
||||
if (!fn->leaf || fn->vararg || fn->dynalloc) {
|
||||
e->fp = RBP;
|
||||
fputs("\tpushq %rbp\n\tmovq %rsp, %rbp\n", f);
|
||||
} else
|
||||
e->fp = RSP;
|
||||
framesz(e);
|
||||
if (e->fsz)
|
||||
fprintf(f, "\tsubq $%"PRIu64", %%rsp\n", e->fsz);
|
||||
if (fn->vararg) {
|
||||
o = -176;
|
||||
for (r=amd64_sysv_rsave; r<&amd64_sysv_rsave[6]; r++, o+=8)
|
||||
|
|
@ -595,15 +635,15 @@ amd64_emitfn(Fn *fn, FILE *f)
|
|||
for (r=amd64_sysv_rclob; r<&amd64_sysv_rclob[NCLR]; r++)
|
||||
if (fn->reg & BIT(*r)) {
|
||||
itmp.arg[0] = TMP(*r);
|
||||
emitf("pushq %L0", &itmp, fn, f);
|
||||
fs += 8;
|
||||
emitf("pushq %L0", &itmp, e);
|
||||
e->nclob++;
|
||||
}
|
||||
|
||||
for (lbl=0, b=fn->start; b; b=b->link) {
|
||||
if (lbl || b->npred > 1)
|
||||
fprintf(f, "%sbb%d:\n", T.asloc, id0+b->id);
|
||||
for (i=b->ins; i!=&b->ins[b->nins]; i++)
|
||||
emitins(*i, fn, f);
|
||||
emitins(*i, e);
|
||||
lbl = 1;
|
||||
switch (b->jmp.type) {
|
||||
case Jhlt:
|
||||
|
|
@ -614,17 +654,19 @@ amd64_emitfn(Fn *fn, FILE *f)
|
|||
fprintf(f,
|
||||
"\tmovq %%rbp, %%rsp\n"
|
||||
"\tsubq $%"PRIu64", %%rsp\n",
|
||||
fs
|
||||
);
|
||||
e->fsz + e->nclob * 8);
|
||||
for (r=&amd64_sysv_rclob[NCLR]; r>amd64_sysv_rclob;)
|
||||
if (fn->reg & BIT(*--r)) {
|
||||
itmp.arg[0] = TMP(*r);
|
||||
emitf("popq %L0", &itmp, fn, f);
|
||||
emitf("popq %L0", &itmp, e);
|
||||
}
|
||||
if (e->fp == RBP)
|
||||
fputs("\tleave\n", f);
|
||||
else if (e->fsz)
|
||||
fprintf(f,
|
||||
"\tleave\n"
|
||||
"\tret\n"
|
||||
);
|
||||
"\taddq $%"PRIu64", %%rsp\n",
|
||||
e->fsz);
|
||||
fputs("\tret\n", f);
|
||||
break;
|
||||
case Jjmp:
|
||||
Jmp:
|
||||
|
|
|
|||
|
|
@ -808,6 +808,7 @@ amd64_isel(Fn *fn)
|
|||
die("alloc too large");
|
||||
fn->tmp[i->to.val].slot = fn->slot;
|
||||
fn->slot += sz;
|
||||
fn->salign = 2 + al - Oalloc;
|
||||
*i = (Ins){.op = Onop};
|
||||
}
|
||||
|
||||
|
|
|
|||
2
parse.c
2
parse.c
|
|
@ -694,6 +694,7 @@ parseline(PState ps)
|
|||
goto Ins;
|
||||
}
|
||||
if (op == Tcall) {
|
||||
curf->leaf = 0;
|
||||
arg[0] = parseref();
|
||||
parserefl(1);
|
||||
op = Ocall;
|
||||
|
|
@ -910,6 +911,7 @@ parsefn(Lnk *lnk)
|
|||
curf->con[0].bits.i = 0xdeaddead; /* UNDEF */
|
||||
curf->con[1].type = CBits;
|
||||
curf->lnk = *lnk;
|
||||
curf->leaf = 1;
|
||||
blink = &curf->start;
|
||||
curf->retty = Kx;
|
||||
if (peek() != Tglo)
|
||||
|
|
|
|||
Loading…
Reference in a new issue