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[x86] add test for miscompiling setcc transform (PR40657); NFC

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llvm-svn: 353580
This commit is contained in:
Sanjay Patel 2019-02-08 23:34:57 +00:00
parent aa89ecf9c8
commit e314e9709a
1 changed files with 18 additions and 0 deletions
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18
test/CodeGen/X86/setcc-combine.ll
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@ -262,3 +262,21 @@ define void @test_i1_uge(i1 *%A2) {
ret void
}
; FIXME: This should not get folded to 0.
define i64 @PR40657(i8 %var2, i8 %var9) {
; CHECK-LABEL: PR40657:
; CHECK: # %bb.0:
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: retq
%var6 = trunc i8 %var9 to i1
%var7 = trunc i8 175 to i1
%var3 = sub nsw i1 %var6, %var7
%var4 = icmp eq i64 1114591064, 1114591064
%var1 = udiv i1 %var3, %var4
%var0 = trunc i8 %var2 to i1
%res = sub nsw nuw i1 %var0, %var1
%res.cast = zext i1 %res to i64
ret i64 %res.cast
}