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https://github.com/c64scene-ar/llvm-6502.git
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84bd6b0c31
to determine where to place PHIs by iteratively comparing reaching definitions at each block. That was just plain wrong. This version now computes the dominator tree within the subset of the CFG where PHIs may need to be placed, and then places the PHIs in the iterated dominance frontier of each definition. The rest of the patch is mostly the same, with a few more performance improvements added in. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101612 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.3 KiB
LLVM
47 lines
1.3 KiB
LLVM
; RUN: opt < %s -gvn -enable-full-load-pre -S | FileCheck %s
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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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; CHECK: bb11:
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; CHECK: phi
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; CHECK-NOT: phi
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br label %bb12
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bb12: ; preds = %bb11, %bb6
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; CHECK: bb12:
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; CHECK: phi
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; CHECK-NOT: phi
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br i1 undef, label %bb8, label %bb13
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bb13: ; preds = %bb12
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; CHECK: bb13:
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ret i8* undef
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}
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