6c75ab5f66
WG14 adopted the _ExtInt feature from Clang for C23, but renamed the type to be _BitInt. This patch does the vast majority of the work to rename _ExtInt to _BitInt, which accounts for most of its size. The new type is exposed in older C modes and all C++ modes as a conforming extension. However, there are functional changes worth calling out: * Deprecates _ExtInt with a fix-it to help users migrate to _BitInt. * Updates the mangling for the type. * Updates the documentation and adds a release note to warn users what is going on. * Adds new diagnostics for use of _BitInt to call out when it's used as a Clang extension or as a pre-C23 compatibility concern. * Adds new tests for the new diagnostic behaviors. I want to call out the ABI break specifically. We do not believe that this break will cause a significant imposition for early adopters of the feature, and so this is being done as a full break. If it turns out there are critical uses where recompilation is not an option for some reason, we can consider using ABI tags to ease the transition.
22 lines
632 B
Common Lisp
22 lines
632 B
Common Lisp
// RUN: %clang -cc1 -triple x86_64-linux-pc -O3 -disable-llvm-passes %s -emit-llvm -o - | FileCheck %s
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void Shifts(_BitInt(12) E, int i) {
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E << 99;
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// CHECK: shl i12 %{{.+}}, 3
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77 << E;
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// CHECK: %[[PROM:.+]] = zext i12 %{{.+}} to i32
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// CHECK: %[[MASK:.+]] = and i32 %[[PROM]], 31
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// CHECK: shl i32 77, %[[MASK]]
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E << i;
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// CHECK: %[[PROM:.+]] = trunc i32 %{{.+}} to i12
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// CHECK: %[[MASK:.+]] = urem i12 %[[PROM]], 12
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// CHECK: shl i12 %{{.+}}, %[[MASK]]
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i << E;
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// CHECK: %[[PROM:.+]] = zext i12 %{{.+}} to i32
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// CHECK: %[[MASK:.+]] = and i32 %[[PROM]], 31
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// CHECK: shl i32 %{{.+}}, %[[MASK]]
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}
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