deaf22bc0e
The "-fzero-call-used-regs" option tells the compiler to zero out certain registers before the function returns. It's also available as a function attribute: zero_call_used_regs. The two upper categories are: - "used": Zero out used registers. - "all": Zero out all registers, whether used or not. The individual options are: - "skip": Don't zero out any registers. This is the default. - "used": Zero out all used registers. - "used-arg": Zero out used registers that are used for arguments. - "used-gpr": Zero out used registers that are GPRs. - "used-gpr-arg": Zero out used GPRs that are used as arguments. - "all": Zero out all registers. - "all-arg": Zero out all registers used for arguments. - "all-gpr": Zero out all GPRs. - "all-gpr-arg": Zero out all GPRs used for arguments. This is used to help mitigate Return-Oriented Programming exploits. Reviewed By: nickdesaulniers Differential Revision: https://reviews.llvm.org/D110869
29 lines
1.5 KiB
LLVM
29 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
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define dso_local float @foo() local_unnamed_addr #0 {
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; CHECK-LABEL: foo:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: xorps %xmm0, %xmm0
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; CHECK-NEXT: xorps %xmm1, %xmm1
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; CHECK-NEXT: callq fmod
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; CHECK-NEXT: cvtsd2ss %xmm0, %xmm0
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; CHECK-NEXT: popq %rax
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: xorps %xmm1, %xmm1
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; CHECK-NEXT: retq
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entry:
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%call = call nnan ninf double @fmod(double 0.000000e+00, double 0.000000e+00) #2
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%conv = fptrunc double %call to float
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ret float %conv
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}
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declare dso_local double @fmod(double, double) local_unnamed_addr #1
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attributes #0 = { mustprogress nofree nounwind uwtable willreturn "frame-pointer"="none" "min-legal-vector-width"="0" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "zero-call-used-regs"="used" }
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attributes #1 = { mustprogress nofree nounwind willreturn "frame-pointer"="none" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "zero-call-used-regs"="used" }
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attributes #2 = { nounwind }
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