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50 lines
1.1 KiB
LLVM
50 lines
1.1 KiB
LLVM
; RUN: llc < %s -march=x86-64 -mcpu=generic | FileCheck %s
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; RUN: llc < %s -march=x86 -mcpu=generic | FileCheck %s --check-prefix=CHECK --check-prefix=X86
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; Verify that we correctly lower ISD::READCYCLECOUNTER.
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define i64 @test_builtin_readcyclecounter() {
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%1 = tail call i64 @llvm.readcyclecounter()
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ret i64 %1
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}
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; CHECK-LABEL: test_builtin_readcyclecounter
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; CHECK: rdtsc
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; X86-NOT: shlq
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; X86-NOT: or
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; CHECK-NOT: mov
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; CHECK: ret
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; Verify that we correctly lower the Read Cycle Counter GCC x86 builtins
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; (i.e. RDTSC and RDTSCP).
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define i64 @test_builtin_rdtsc() {
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%1 = tail call i64 @llvm.x86.rdtsc()
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ret i64 %1
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}
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; CHECK-LABEL: test_builtin_rdtsc
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; CHECK: rdtsc
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; X86-NOT: shlq
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; X86-NOT: or
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; CHECK-NOT: mov
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; CHECK: ret
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define i64 @test_builtin_rdtscp(i8* %A) {
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%1 = tail call i64 @llvm.x86.rdtscp(i8* %A)
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ret i64 %1
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}
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; CHECK-LABEL: test_builtin_rdtscp
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; CHECK: rdtscp
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; X86-NOT: shlq
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; CHECK: movl %ecx, (%{{[a-z0-9]+}})
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; X86-NOT: shlq
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; CHECK: ret
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declare i64 @llvm.readcyclecounter()
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declare i64 @llvm.x86.rdtscp(i8*)
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declare i64 @llvm.x86.rdtsc()
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