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e.g. define i32 @t1(i32 %c, i32 %x) nounwind { %t1 = icmp eq i32 %c, 0 %t2 = lshr i32 %x, 18 %t3 = select i1 %t1, i32 %t2, i32 %x ret i32 %t3 } was turned into define i32 @t2(i32 %c, i32 %x) nounwind { %t1 = icmp eq i32 %c, 0 %t2 = select i1 %t1, i32 18, i32 0 %t3 = lshr i32 %x, %t2 ret i32 %t3 } For most targets, that means materializing two constants and then a select. e.g. On x86-64 movl %esi, %eax shrl $18, %eax testl %edi, %edi cmovne %esi, %eax ret => xorl %eax, %eax testl %edi, %edi movl $18, %ecx cmovne %eax, %ecx movl %esi, %eax shrl %cl, %eax ret Also, the optimizer and codegen can reason about shl / and / add, etc. by a constant. This optimization will hinder optimizations using ComputeMaskedBits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68142 91177308-0d34-0410-b5e6-96231b3b80d8
19 lines
543 B
LLVM
19 lines
543 B
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep select | count 2
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; Make sure instcombine don't fold select into operands. We don't want to emit
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; select of two integers unless it's selecting 0 / 1.
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define i32 @t1(i32 %c, i32 %x) nounwind {
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%t1 = icmp eq i32 %c, 0
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%t2 = lshr i32 %x, 18
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%t3 = select i1 %t1, i32 %t2, i32 %x
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ret i32 %t3
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}
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define i32 @t2(i32 %c, i32 %x) nounwind {
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%t1 = icmp eq i32 %c, 0
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%t2 = and i32 %x, 18
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%t3 = select i1 %t1, i32 %t2, i32 %x
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ret i32 %t3
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}
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