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The original implementation attempted to zero registers using XOR %foo, %foo. This is problematic because it constitutes a read-modify-write of a register which might not be defined. Instead, use MOV32r0 to avoid these problems; expandPostRAPseudo does the right thing here. llvm-svn: 274024
26 lines
699 B
LLVM
26 lines
699 B
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=knl --show-mc-encoding -verify-machineinstrs | FileCheck %s
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declare i32 @llvm.x86.rdpkru()
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declare void @llvm.x86.wrpkru(i32)
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define void @test_x86_wrpkru(i32 %src) {
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; CHECK-LABEL: test_x86_wrpkru:
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; CHECK: ## BB#0:
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; CHECK-NEXT: xorl %ecx, %ecx
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; CHECK-NEXT: xorl %edx, %edx
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; CHECK-NEXT: movl %edi, %eax
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; CHECK-NEXT: wrpkru
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; CHECK-NEXT: retq
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call void @llvm.x86.wrpkru(i32 %src)
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ret void
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}
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define i32 @test_x86_rdpkru() {
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; CHECK-LABEL: test_x86_rdpkru:
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; CHECK: ## BB#0:
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; CHECK-NEXT: xorl %ecx, %ecx
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; CHECK-NEXT: rdpkru
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; CHECK-NEXT: retq
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%res = call i32 @llvm.x86.rdpkru()
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ret i32 %res
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}
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