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[X86] pr40090.ll - add ctlz(x,false) (zero isn't poison) test coverage

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Simon Pilgrim
2025-06-10 18:23:50 +01:00
parent 522a375b99
commit b053f955da
1 changed files with 22 additions and 0 deletions
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22
llvm/test/CodeGen/X86/pr40090.ll
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@@ -21,4 +21,26 @@ define i64 @foo(i64 %x, i64 %y) {
ret i64 %7
}
define i64 @bar(i64 %x, i64 %y) {
; CHECK-LABEL: bar:
; CHECK: # %bb.0:
; CHECK-NEXT: movl $127, %ecx
; CHECK-NEXT: movl $127, %eax
; CHECK-NEXT: bsrq %rdi, %rax
; CHECK-NEXT: xorq $64, %rax
; CHECK-NEXT: bsrq %rsi, %rcx
; CHECK-NEXT: cmoveq %rax, %rcx
; CHECK-NEXT: movl $63, %eax
; CHECK-NEXT: subq %rcx, %rax
; CHECK-NEXT: retq
%1 = tail call i64 @llvm.ctlz.i64(i64 %x, i1 false)
%2 = xor i64 %1, 127
%3 = tail call i64 @llvm.ctlz.i64(i64 %y, i1 false)
%4 = xor i64 %3, 63
%5 = icmp eq i64 %y, 0
%6 = select i1 %5, i64 %2, i64 %4
%7 = sub nsw i64 63, %6
ret i64 %7
}
declare i64 @llvm.ctlz.i64(i64, i1)