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llvm-mirror/test/Transforms/GVN/2010-03-31-RedundantPHIs.ll

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Make BasicAliasAnalysis a normal AliasAnalysis implementation which does normal initialization and normal chaining. Change the default AliasAnalysis implementation to NoAlias. Update StandardCompileOpts.h and friends to explicitly request BasicAliasAnalysis. Update tests to explicitly request -basicaa. llvm-svn: 116720
2010-10-18 20:04:47 +02:00
; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
Re-commit my previous SSAUpdater changes. The previous version naively tried 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. llvm-svn: 101612
2010-04-17 05:08:24 +02:00
Teach InstructionSimplify about phi nodes. I chose to have it simply 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). llvm-svn: 119043
2010-11-14 14:30:18 +01:00
; CHECK-NOT: load
; CHECK-NOT: phi
Re-commit my previous SSAUpdater changes. The previous version naively tried 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. llvm-svn: 101612
2010-04-17 05:08:24 +02:00
define i8* @cat(i8* %s1, ...) nounwind {
entry:
br i1 undef, label %bb, label %bb3
bb: ; preds = %entry
unreachable
bb3: ; preds = %entry
store i8* undef, i8** undef, align 4
br i1 undef, label %bb5, label %bb6
bb5: ; preds = %bb3
unreachable
bb6: ; preds = %bb3
br label %bb12
bb8: ; preds = %bb12
br i1 undef, label %bb9, label %bb10
bb9: ; preds = %bb8
%0 = load i8** undef, align 4 ; <i8*> [#uses=0]
%1 = load i8** undef, align 4 ; <i8*> [#uses=0]
br label %bb11
bb10: ; preds = %bb8
br label %bb11
bb11: ; preds = %bb10, %bb9
br label %bb12
bb12: ; preds = %bb11, %bb6
br i1 undef, label %bb8, label %bb13
bb13: ; preds = %bb12
ret i8* undef
}
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