From 8ce070ebddf8c59e58a8be3983add5b01728f50f Mon Sep 17 00:00:00 2001
From: Orlando Cazalet-Hyams <orlando.hyams@sony.com>
Date: Thu, 3 Apr 2025 13:36:59 +0100
Subject: [PATCH] [KeyInstr] Complex assignment atoms
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
---
clang/lib/CodeGen/CGExprComplex.cpp | 10 +++++--
clang/test/KeyInstructions/complex.c | 40 ++++++++++++++++++++++++++++
2 files changed, 48 insertions(+), 2 deletions(-)
create mode 100644 clang/test/KeyInstructions/complex.c
diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp
index a7c8b96da685..ff960e76e869 100644
--- a/clang/lib/CodeGen/CGExprComplex.cpp
+++ b/clang/lib/CodeGen/CGExprComplex.cpp
@@ -456,8 +456,12 @@ void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, LValue lvalue,
Address RealPtr = CGF.emitAddrOfRealComponent(Ptr, lvalue.getType());
Address ImagPtr = CGF.emitAddrOfImagComponent(Ptr, lvalue.getType());
- Builder.CreateStore(Val.first, RealPtr, lvalue.isVolatileQualified());
- Builder.CreateStore(Val.second, ImagPtr, lvalue.isVolatileQualified());
+ auto *R =
+ Builder.CreateStore(Val.first, RealPtr, lvalue.isVolatileQualified());
+ CGF.addInstToCurrentSourceAtom(R, Val.first);
+ auto *I =
+ Builder.CreateStore(Val.second, ImagPtr, lvalue.isVolatileQualified());
+ CGF.addInstToCurrentSourceAtom(I, Val.second);
}
@@ -1204,6 +1208,7 @@ LValue ComplexExprEmitter::
EmitCompoundAssignLValue(const CompoundAssignOperator *E,
ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
RValue &Val) {
+ ApplyAtomGroup Grp(CGF.getDebugInfo());
TestAndClearIgnoreReal();
TestAndClearIgnoreImag();
QualType LHSTy = E->getLHS()->getType();
@@ -1351,6 +1356,7 @@ LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
}
ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
+ ApplyAtomGroup Grp(CGF.getDebugInfo());
ComplexPairTy Val;
LValue LV = EmitBinAssignLValue(E, Val);
diff --git a/clang/test/KeyInstructions/complex.c b/clang/test/KeyInstructions/complex.c
new file mode 100644
index 000000000000..b97314e815bd
--- /dev/null
+++ b/clang/test/KeyInstructions/complex.c
@@ -0,0 +1,40 @@
+
+// RUN: %clang -gkey-instructions -x c++ %s -gmlt -gcolumn-info -S -emit-llvm -o - -Wno-unused-variable \
+// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank
+
+// RUN: %clang -gkey-instructions -x c %s -gmlt -gcolumn-info -S -emit-llvm -o - -Wno-unused-variable \
+// RUN: | FileCheck %s --implicit-check-not atomGroup --implicit-check-not atomRank
+
+_Complex float ci;
+void test() {
+// CHECK: %ci.real = load float, ptr @ci{{.*}}, !dbg [[G1R2:!.*]]
+// CHECK: %ci.imag = load float, ptr getelementptr inbounds nuw ({ float, float }, ptr @ci, i32 0, i32 1){{.*}}, !dbg [[G1R2]]
+// CHECK: store float %ci.real, ptr %lc.realp{{.*}}, !dbg [[G1R1:!.*]]
+// CHECK: store float %ci.imag, ptr %lc.imagp{{.*}}, !dbg [[G1R1]]
+ _Complex float lc = ci;
+
+// CHECK: %ci.real1 = load float, ptr @ci{{.*}}, !dbg [[G2R2:!.*]]
+// CHECK: %ci.imag2 = load float, ptr getelementptr inbounds nuw ({ float, float }, ptr @ci, i32 0, i32 1){{.*}}, !dbg [[G2R2]]
+// CHECK: store float %ci.real1, ptr @ci{{.*}}, !dbg [[G2R1:!.*]]
+// CHECK: store float %ci.imag2, ptr getelementptr inbounds nuw ({ float, float }, ptr @ci, i32 0, i32 1){{.*}}, !dbg [[G2R1]]
+ ci = ci;
+
+// CHECK: %add.r = fadd float %ci.real5, %ci.real3, !dbg [[G3R2:!.*]]
+// CHECK: %add.i = fadd float %ci.imag6, %ci.imag4, !dbg [[G3R2]]
+// CHECK: store float %add.r, ptr @ci{{.*}}, !dbg [[G3R1:!.*]]
+// CHECK: store float %add.i, ptr getelementptr inbounds nuw ({ float, float }, ptr @ci, i32 0, i32 1){{.*}}, !dbg [[G3R1]]
+ ci += ci;
+
+// CHECK: %add = fadd float %0, %1, !dbg [[G4R2:!.*]]
+// CHECK: store float %add, ptr getelementptr inbounds nuw ({ float, float }, ptr @ci, i32 0, i32 1){{.*}}, !dbg [[G4R1:!.*]]
+ __imag ci = __imag ci + __imag ci;
+}
+
+// CHECK: [[G1R2]] = !DILocation({{.*}}, atomGroup: 1, atomRank: 2)
+// CHECK: [[G1R1]] = !DILocation({{.*}}, atomGroup: 1, atomRank: 1)
+// CHECK: [[G2R2]] = !DILocation({{.*}}, atomGroup: 2, atomRank: 2)
+// CHECK: [[G2R1]] = !DILocation({{.*}}, atomGroup: 2, atomRank: 1)
+// CHECK: [[G3R2]] = !DILocation({{.*}}, atomGroup: 3, atomRank: 2)
+// CHECK: [[G3R1]] = !DILocation({{.*}}, atomGroup: 3, atomRank: 1)
+// CHECK: [[G4R2]] = !DILocation({{.*}}, atomGroup: 4, atomRank: 2)
+// CHECK: [[G4R1]] = !DILocation({{.*}}, atomGroup: 4, atomRank: 1)