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[X86] Add test case for pr40539. NFC

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llvm-svn: 352697
This commit is contained in:
Craig Topper 2019-01-31 00:04:42 +00:00
parent 845f861c09
commit 818846eaba
1 changed files with 36 additions and 0 deletions
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test/CodeGen/X86/pr40539.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i686-unknown-unknown -mcpu=pentium4 | FileCheck %s
; FIXME: The fstps in the following test case should be between the inline
; assembly expansion and the cmpeqss. The postRA scheduler has rearranged them.
@f1 = global float 1.000000e+00, align 4
define zeroext i1 @_Z9test_log2v() {
; CHECK-LABEL: _Z9test_log2v:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushl %eax
; CHECK-NEXT: .cfi_def_cfa_offset 8
; CHECK-NEXT: flds f1
; CHECK-NEXT: fstps (%esp)
; CHECK-NEXT: xorps %xmm0, %xmm0
; CHECK-NEXT: #APP
; CHECK-NEXT: fld1
; CHECK-NEXT: fxch %st(1)
; CHECK-NEXT: fyl2x
; CHECK-NEXT: #NO_APP
; CHECK-NEXT: cmpeqss (%esp), %xmm0
; CHECK-NEXT: movd %xmm0, %eax
; CHECK-NEXT: andl $1, %eax
; CHECK-NEXT: # kill: def $al killed $al killed $eax
; CHECK-NEXT: popl %ecx
; CHECK-NEXT: .cfi_def_cfa_offset 4
; CHECK-NEXT: retl
entry:
%0 = load float, float* @f1, align 4
%1 = fpext float %0 to x86_fp80
%2 = tail call x86_fp80 asm "fld1; fxch; fyl2x", "={st},0,~{st(1)},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %1)
%conv = fptrunc x86_fp80 %2 to float
%3 = fcmp oeq float %conv, 0.000000e+00
ret i1 %3
}