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[CIR][CodeGen] Support for BI__rdtsc #1523

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Merged
merged 5 commits into from
Mar 26, 2025
Merged

[CIR][CodeGen] Support for BI__rdtsc #1523

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6d8dfe1
implement BI__rdtsc
shrikardongre Mar 24, 2025
8d98d19
clang-format
shrikardongre Mar 24, 2025
c442823
add cast to return unsigned long long
shrikardongre Mar 25, 2025
4c70608
remove trailing space
shrikardongre Mar 25, 2025
4d1c5ba
Merge branch 'main' into implement_rdtsc
shrikardongre Mar 25, 2025
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7 changes: 7 additions & 0 deletions clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -122,5 +122,12 @@ mlir::Value CIRGenFunction::emitX86BuiltinExpr(unsigned BuiltinID,
voidTy)
.getResult();
}
case X86::BI__rdtsc: {
mlir::Type intTy = cir::IntType::get(&getMLIRContext(), 64, false);
return builder
.create<cir::LLVMIntrinsicCallOp>(
getLoc(E->getExprLoc()), builder.getStringAttr("x86.rdtsc"), intTy)
.getResult();
}
}
}
8 changes: 8 additions & 0 deletions clang/test/CIR/CodeGen/X86/builtins-x86.c
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Expand Up @@ -29,3 +29,11 @@ void test_mm_pause() {
// CIR: {{%.*}} = cir.llvm.intrinsic "x86.sse2.pause" : () -> !void
// LLVM: call void @llvm.x86.sse2.pause()
}

unsigned long long test_rdtsc() {
// CIR-LABEL: @test_rdtsc
// LLVM-LABEL: @test_rdtsc
return __rdtsc();
// CIR: {{%.*}} = cir.llvm.intrinsic "x86.rdtsc" : () -> !u64i
// LLVM: call i64 @llvm.x86.rdtsc
}
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