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102f3851bb
when the condition is constant. This optimization shouldn't be necessary, because codegen shouldn't be able to find dead control paths that the IR-level optimizer can't find. And it's undesirable, because it encourages bugpoint to leave "br i1 false" branches in its output. And it wasn't updating the CFG. I updated all the tests I could, but some tests are too reduced and I wasn't able to meaningfully preserve them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106748 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
1.2 KiB
LLVM
33 lines
1.2 KiB
LLVM
; RUN: llc < %s -march=x86 | not grep movb
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define i16 @f(i32* %bp, i32* %ss) signext {
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entry:
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br label %cond_next127
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cond_next127: ; preds = %cond_next391, %entry
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%v.1 = phi i32 [ undef, %entry ], [ %tmp411, %cond_next391 ] ; <i32> [#uses=1]
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%tmp149 = mul i32 0, %v.1 ; <i32> [#uses=0]
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%tmp254 = and i32 0, 15 ; <i32> [#uses=1]
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%tmp256 = and i32 0, 15 ; <i32> [#uses=2]
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br label %cond_next391
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cond_next391: ; preds = %cond_next127
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%tmp393 = load i32* %ss, align 4 ; <i32> [#uses=1]
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%tmp395 = load i32* %bp, align 4 ; <i32> [#uses=2]
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%tmp396 = shl i32 %tmp393, %tmp395 ; <i32> [#uses=2]
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%tmp398 = sub i32 32, %tmp256 ; <i32> [#uses=2]
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%tmp399 = lshr i32 %tmp396, %tmp398 ; <i32> [#uses=1]
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%tmp405 = lshr i32 %tmp396, 31 ; <i32> [#uses=1]
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%tmp406 = add i32 %tmp405, -1 ; <i32> [#uses=1]
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%tmp409 = lshr i32 %tmp406, %tmp398 ; <i32> [#uses=1]
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%tmp411 = sub i32 %tmp399, %tmp409 ; <i32> [#uses=1]
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%tmp422445 = add i32 %tmp254, 0 ; <i32> [#uses=1]
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%tmp426447 = add i32 %tmp395, %tmp256 ; <i32> [#uses=1]
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store i32 %tmp426447, i32* %bp, align 4
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%tmp429448 = icmp ult i32 %tmp422445, 63 ; <i1> [#uses=1]
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br i1 %tmp429448, label %cond_next127, label %UnifiedReturnBlock
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UnifiedReturnBlock: ; preds = %cond_next391
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ret i16 0
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}
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