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Fix _mm_movemask_epi8

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The order of iteration was wrong
This commit is contained in:
bjorn3 2019-07-29 18:59:17 +02:00
parent aae9a8b91d
commit ee4927e069
2 changed files with 4 additions and 1 deletions
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3
example/std_example.rs
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@ -67,6 +67,9 @@ unsafe fn test_simd() {
test_mm_slli_si128();
test_mm_movemask_epi8();
test_mm256_movemask_epi8();
let mask1 = _mm_movemask_epi8(dbg!(_mm_setr_epi8(255u8 as i8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)));
assert_eq!(mask1, 1);
}
#[target_feature(enable = "sse2")]

2
src/llvm_intrinsics.rs
View file

@ -41,7 +41,7 @@ pub fn codegen_llvm_intrinsic_call<'a, 'tcx: 'a>(
let mut res = fx.bcx.ins().iconst(types::I32, 0);
for lane in 0..lane_count {
for lane in (0..lane_count).rev() {
let a_lane = a.value_field(fx, mir::Field::new(lane.try_into().unwrap())).load_scalar(fx);
let a_lane_sign = fx.bcx.ins().ushr_imm(a_lane, 7); // extract sign bit of 8bit int
let a_lane_sign = fx.bcx.ins().uextend(types::I32, a_lane_sign);