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[KeyInstr][Clang] Assign vector element atom

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This patch is part of a stack that teaches Clang to generate Key Instructions
metadata for C and C++.

The Key Instructions project is introduced, including a "quick summary" section
at the top which adds context for this PR, here:
https://discourse.llvm.org/t/rfc-improving-is-stmt-placement-for-better-interactive-debugging/82668

The feature is only functional in LLVM if LLVM is built with CMake flag
LLVM_EXPERIMENTAL_KEY_INSTRUCTIONs. Eventually that flag will be removed.

The Clang-side work is demoed here:
https://github.com/llvm/llvm-project/pull/130943
This commit is contained in:
Orlando Cazalet-Hyams 2025-04-03 21:56:37 +01:00
parent 1c670c04c0
commit 85936471fc
2 changed files with 12 additions and 3 deletions
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5
clang/lib/CodeGen/CGExpr.cpp
View File

@ -2456,8 +2456,9 @@ void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
Vec = Builder.CreateBitCast(Vec, IRStoreTy);
}
Builder.CreateStore(Vec, Dst.getVectorAddress(),
Dst.isVolatileQualified());
auto *I = Builder.CreateStore(Vec, Dst.getVectorAddress(),
Dst.isVolatileQualified());
addInstToCurrentSourceAtom(I, Vec);
return;
}

10
clang/test/KeyInstructions/agg.c
View File

@ -1,9 +1,10 @@
// RUN: %clang -gkey-instructions -x c++ %s -gmlt -S -emit-llvm -o - \
// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank
// RUN: %clang -gkey-instructions -x c %s -gmlt -S -emit-llvm -o - \
// RUN: %clang -gkey-instructions -x c %s -gmlt -S -emit-llvm -o - \
// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank
__attribute__((ext_vector_type(1))) char c;
typedef struct { int a, b, c; } Struct;
void fun(Struct a) {
// CHECK: call void @llvm.memcpy{{.*}}, !dbg [[G1R1:!.*]]
@ -11,7 +12,14 @@ void fun(Struct a) {
// CHECK: call void @llvm.memcpy{{.*}}, !dbg [[G2R1:!.*]]
b = a;
// CHECK: %2 = load <1 x i8>, ptr @c
// CHECK: %vecins = insertelement <1 x i8> %2, i8 0, i32 0, !dbg [[G3R2:!.*]]
// CHECK: store <1 x i8> %vecins, ptr @c{{.*}}, !dbg [[G3R1:!.*]]
c[0] = 0;
}
// CHECK: [[G1R1]] = !DILocation({{.*}}, atomGroup: 1, atomRank: 1)
// CHECK: [[G2R1]] = !DILocation({{.*}}, atomGroup: 2, atomRank: 1)
// CHECK: [[G3R2]] = !DILocation({{.*}}, atomGroup: 3, atomRank: 2)
// CHECK: [[G3R1]] = !DILocation({{.*}}, atomGroup: 3, atomRank: 1)