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43 lines
915 B
LLVM
43 lines
915 B
LLVM
; RUN: llc < %s -march=x86 -mcpu=yonah | FileCheck %s
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; rdar://5752025
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; We want:
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; CHECK: movl $42, %ecx
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; CHECK-NEXT: movl 4(%esp), %eax
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; CHECK-NEXT: andl $15, %eax
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; CHECK-NEXT: cmovnel %ecx, %eax
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; CHECK-NEXT: ret
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;
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; We don't want:
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; movl 4(%esp), %eax
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; movl %eax, %ecx # bad: extra copy
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; andl $15, %ecx
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; testl $15, %eax # bad: peep obstructed
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; movl $42, %eax
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; cmovel %ecx, %eax
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; ret
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;
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; We also don't want:
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; movl $15, %ecx # bad: larger encoding
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; andl 4(%esp), %ecx
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; movl $42, %eax
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; cmovel %ecx, %eax
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; ret
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;
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; We also don't want:
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; movl 4(%esp), %ecx
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; andl $15, %ecx
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; testl %ecx, %ecx # bad: unnecessary test
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; movl $42, %eax
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; cmovel %ecx, %eax
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; ret
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define i32 @t1(i32 %X) nounwind {
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entry:
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%tmp2 = and i32 %X, 15 ; <i32> [#uses=2]
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%tmp4 = icmp eq i32 %tmp2, 0 ; <i1> [#uses=1]
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%retval = select i1 %tmp4, i32 %tmp2, i32 42 ; <i32> [#uses=1]
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ret i32 %retval
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}
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