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Add a minor optimization: if we haven't changed the operands of an

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add, there is no need to scan the world to find the same add again.
This invalidates the previous testcase, which wasn't wonderful anyway,
because it needed a run of instcombine to permute the use-lists in 
just the right way to before GVN was run (so it was really fragile).
Not a big loss.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90973 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-12-09 17:27:45 +00:00
parent 16f1692dca
commit 4d3a16f81b
2 changed files with 4 additions and 66 deletions
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4
lib/Analysis/PHITransAddr.cpp
View File

@ -275,6 +275,10 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
RemoveInstInputs(LHS, InstInputs);
return AddAsInput(Res);
}
// If we didn't modify the add, just return it.
if (LHS == Inst->getOperand(0) && RHS == Inst->getOperand(1))
return Inst;
// Otherwise, see if we have this add available somewhere.
for (Value::use_iterator UI = LHS->use_begin(), E = LHS->use_end();

66
test/Transforms/GVN/crash-2.ll
View File

@ -1,66 +0,0 @@
; RUN: opt -instcombine -gvn -S %s
; PR5733
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
target triple = "i686-linux-gnu"
@ff_cropTbl = external global [2304 x i8] ; <[2304 x i8]*> [#uses=1]
define void @ff_pred8x8_plane_c(i8* nocapture %src, i32 %stride) nounwind {
entry:
br i1 true, label %bb.nph41, label %for.end
bb.nph41: ; preds = %entry
%sub.ptr.neg37 = sub i32 0, %stride ; <i32> [#uses=1]
%tmp55 = add i32 %sub.ptr.neg37, -1 ; <i32> [#uses=1]
%tmp73 = add i32 %stride, -1 ; <i32> [#uses=2]
%sub.ptr38 = getelementptr i8* %src, i32 %tmp73 ; <i8*> [#uses=1]
%tmp60 = load i8* %sub.ptr38 ; <i8> [#uses=1]
%conv61 = zext i8 %tmp60 to i32 ; <i32> [#uses=1]
%sub62 = sub i32 0, %conv61 ; <i32> [#uses=1]
%mul63 = mul i32 %sub62, 2 ; <i32> [#uses=1]
%add65 = add nsw i32 %mul63, 0 ; <i32> [#uses=1]
%tmp71.2 = mul i32 2, %stride ; <i32> [#uses=1]
%tmp72.2 = sub i32 0, %tmp71.2 ; <i32> [#uses=1]
%tmp74.2 = add i32 %tmp72.2, %tmp73 ; <i32> [#uses=1]
%sub.ptr38.2 = getelementptr i8* %src, i32 %tmp74.2 ; <i8*> [#uses=1]
%tmp60.2 = load i8* %sub.ptr38.2 ; <i8> [#uses=1]
%conv61.2 = zext i8 %tmp60.2 to i32 ; <i32> [#uses=1]
%sub62.2 = sub i32 0, %conv61.2 ; <i32> [#uses=1]
%mul63.2 = mul i32 %sub62.2, 4 ; <i32> [#uses=1]
%add65.2 = add nsw i32 %mul63.2, %add65 ; <i32> [#uses=1]
%scevgep = getelementptr i8* %src, i32 %tmp55 ; <i8*> [#uses=1]
br label %for.end
for.end: ; preds = %for.cond.2, %entry
%V.0.lcssa = phi i32 [ %add65.2, %bb.nph41 ], [ 0, %entry ] ; <i32> [#uses=1]
%src2.0.lcssa = phi i8* [ %scevgep, %bb.nph41 ], [ null, %entry ] ; <i8*> [#uses=1]
%mul71 = mul i32 %V.0.lcssa, 17 ; <i32> [#uses=1]
%add72 = add nsw i32 %mul71, 16 ; <i32> [#uses=1]
%shr73 = ashr i32 %add72, 5 ; <i32> [#uses=1]
br i1 true, label %bb.nph, label %for.end181
bb.nph: ; preds = %for.end
%arrayidx79 = getelementptr inbounds i8* %src2.0.lcssa, i32 8 ; <i8*> [#uses=1]
%tmp80 = load i8* %arrayidx79 ; <i8> [#uses=1]
%tmp9 = mul i32 %shr73, -3 ; <i32> [#uses=1]
%tmp11 = zext i8 %tmp80 to i32 ; <i32> [#uses=1]
%tmp12 = add i32 0, %tmp11 ; <i32> [#uses=1]
%tmp13 = mul i32 %tmp12, 16 ; <i32> [#uses=1]
%tmp38 = add i32 %tmp9, %tmp13 ; <i32> [#uses=1]
%tmp39 = add i32 %tmp38, 16 ; <i32> [#uses=1]
br label %for.body94
for.body94: ; preds = %bb.nph, %for.cond90
%add129 = add i32 0, %tmp39 ; <i32> [#uses=1]
%shr130 = ashr i32 %add129, 5 ; <i32> [#uses=1]
%.sum4 = add i32 %shr130, 1024 ; <i32> [#uses=1]
%arrayidx132 = getelementptr inbounds [2304 x i8]* @ff_cropTbl, i32 0, i32 %.sum4 ; <i8*> [#uses=1]
%tmp133 = load i8* %arrayidx132 ; <i8> [#uses=1]
store i8 %tmp133, i8* undef
br label %for.body94
for.end181: ; preds = %for.cond90.for.end181_crit_edge, %for.end
ret void
}