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https://github.com/c64scene-ar/llvm-6502.git
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cd6636c737
offload the work to hasConstantValue rather than do something more complicated (such handling mutually recursive phis) because (1) it is not clear it is worth it; and (2) if it is worth it, maybe such logic would be better placed in hasConstantValue. Adjust some GVN tests which are now cleaned up much further (eg: all phi nodes are removed). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119043 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1.2 KiB
LLVM
43 lines
1.2 KiB
LLVM
; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
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; CHECK-NOT: load
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; CHECK-NOT: phi
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define i8* @cat(i8* %s1, ...) nounwind {
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entry:
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br i1 undef, label %bb, label %bb3
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bb: ; preds = %entry
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unreachable
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bb3: ; preds = %entry
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store i8* undef, i8** undef, align 4
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br i1 undef, label %bb5, label %bb6
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bb5: ; preds = %bb3
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unreachable
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bb6: ; preds = %bb3
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br label %bb12
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bb8: ; preds = %bb12
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br i1 undef, label %bb9, label %bb10
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bb9: ; preds = %bb8
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%0 = load i8** undef, align 4 ; <i8*> [#uses=0]
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%1 = load i8** undef, align 4 ; <i8*> [#uses=0]
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br label %bb11
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bb10: ; preds = %bb8
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br label %bb11
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bb11: ; preds = %bb10, %bb9
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br label %bb12
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bb12: ; preds = %bb11, %bb6
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br i1 undef, label %bb8, label %bb13
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bb13: ; preds = %bb12
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ret i8* undef
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}
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