2009-03-13 05:22:11 +00:00
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; RUN: llvm-as < %s | llc | not grep cmov
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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target triple = "i386-apple-darwin7"
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; Should compile to setcc | -2.
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; rdar://6668608
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define i32 @test(i32* nocapture %P) nounwind readonly {
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entry:
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%0 = load i32* %P, align 4 ; <i32> [#uses=1]
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%1 = icmp sgt i32 %0, 41 ; <i1> [#uses=1]
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%iftmp.0.0 = select i1 %1, i32 -1, i32 -2 ; <i32> [#uses=1]
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ret i32 %iftmp.0.0
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}
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generalize the previous code to use the full generality of LEA
for i32/i64 expressions (we could also do i16 on cpus where
i16 lea is fast, but I didn't add this). On the example, we now
generate:
_test:
movl 4(%esp), %eax
cmpl $42, (%eax)
setl %al
movzbl %al, %eax
leal 4(%eax,%eax,8), %eax
ret
instead of:
_test:
movl 4(%esp), %eax
cmpl $41, (%eax)
movl $4, %ecx
movl $13, %eax
cmovg %ecx, %eax
ret
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66869 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-13 05:53:31 +00:00
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; setl %al
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; movzbl %al, %eax
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; leal 4(%eax,%eax,8), %eax
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define i32 @test2(i32* nocapture %P) nounwind readonly {
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entry:
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%0 = load i32* %P, align 4 ; <i32> [#uses=1]
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%1 = icmp sgt i32 %0, 41 ; <i1> [#uses=1]
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%iftmp.0.0 = select i1 %1, i32 4, i32 13 ; <i32> [#uses=1]
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ret i32 %iftmp.0.0
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}
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