62 lines
1.3 KiB
LLVM
62 lines
1.3 KiB
LLVM
; RUN: llc < %s -mcpu=generic -mtriple=x86_64-linux | FileCheck %s
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@flags_gv = global i64 0
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; First without noredzone.
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; CHECK-LABEL: f0:
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; CHECK: -4(%rsp)
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; CHECK: -4(%rsp)
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; CHECK: ret
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define x86_fp80 @f0(float %f) nounwind {
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entry:
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%0 = fpext float %f to x86_fp80 ; <x86_fp80> [#uses=1]
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ret x86_fp80 %0
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}
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; Then with noredzone.
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; CHECK-LABEL: f1:
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; CHECK: subq $4, %rsp
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; CHECK: (%rsp)
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; CHECK: (%rsp)
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; CHECK: addq $4, %rsp
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; CHECK: ret
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define x86_fp80 @f1(float %f) nounwind noredzone {
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entry:
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%0 = fpext float %f to x86_fp80 ; <x86_fp80> [#uses=1]
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ret x86_fp80 %0
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}
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declare i64 @llvm.x86.flags.read.u64()
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declare void @llvm.x86.flags.write.u64(i64)
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; pushfq and popfq prevent redzones.
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; CHECK-LABEL: norz_flags_read:
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; CHECK: subq ${{[0-9]+}}, %rsp
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; CHECK: pushfq
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; CHECK: popq
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; CHECK: (%rsp)
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; CHECK: (%rsp)
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; CHECK: ret
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define x86_fp80 @norz_flags_read(float %f) nounwind {
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entry:
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%flags = call i64 @llvm.x86.flags.read.u64()
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store i64 %flags, ptr @flags_gv
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%0 = fpext float %f to x86_fp80
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ret x86_fp80 %0
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}
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; CHECK-LABEL: norz_flags_write:
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; CHECK: subq ${{[0-9]+}}, %rsp
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; CHECK: pushq
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; CHECK: popfq
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; CHECK: (%rsp)
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; CHECK: (%rsp)
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; CHECK: ret
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define x86_fp80 @norz_flags_write(float %f, i64 %flags) nounwind {
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entry:
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call void @llvm.x86.flags.write.u64(i64 %flags)
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%0 = fpext float %f to x86_fp80
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ret x86_fp80 %0
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}
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