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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
43 lines
1.1 KiB
LLVM
43 lines
1.1 KiB
LLVM
; RUN: llc < %s -march=x86-64 > %t
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; RUN: grep movb %t | count 2
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; RUN: grep {movzb\[wl\]} %t
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define void @handle_vector_size_attribute() nounwind {
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entry:
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%tmp69 = load i32* null ; <i32> [#uses=1]
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switch i32 %tmp69, label %bb84 [
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i32 2, label %bb77
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i32 1, label %bb77
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]
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bb77: ; preds = %entry, %entry
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%tmp99 = udiv i64 0, 0 ; <i64> [#uses=1]
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%tmp = load i8* null ; <i8> [#uses=1]
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%tmp114 = icmp eq i64 0, 0 ; <i1> [#uses=1]
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br label %cond_true115
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bb84: ; preds = %entry
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ret void
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cond_true115: ; preds = %bb77
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%tmp118 = load i8* null ; <i8> [#uses=1]
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br label %cond_true120
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cond_true120: ; preds = %cond_true115
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%tmp127 = udiv i8 %tmp, %tmp118 ; <i8> [#uses=1]
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%tmp127.upgrd.1 = zext i8 %tmp127 to i64 ; <i64> [#uses=1]
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br label %cond_next129
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cond_next129: ; preds = %cond_true120, %cond_true115
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%iftmp.30.0 = phi i64 [ %tmp127.upgrd.1, %cond_true120 ] ; <i64> [#uses=1]
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%tmp132 = icmp eq i64 %iftmp.30.0, %tmp99 ; <i1> [#uses=1]
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br i1 %tmp132, label %cond_false148, label %cond_next136
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cond_next136: ; preds = %cond_next129, %bb77
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ret void
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cond_false148: ; preds = %cond_next129
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ret void
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}
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