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Filter loops that subtract induction variables.

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These loops are not yet handled.

Fix PR 1912.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46484 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2008-01-29 02:20:41 +00:00
parent 053c1da8d9
commit c840da14c6
2 changed files with 63 additions and 17 deletions
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34
lib/Transforms/Scalar/LoopIndexSplit.cpp
View File

@ -301,23 +301,23 @@ void LoopIndexSplit::findIndVar(Value *V, Loop *L) {
Value *Op0 = I->getOperand(0);
Value *Op1 = I->getOperand(1);
if (PHINode *PN = dyn_cast<PHINode>(Op0)) {
if (PN->getParent() == L->getHeader()
&& isa<ConstantInt>(Op1)) {
IndVar = PN;
IndVarIncrement = I;
return;
}
}
if (PHINode *PN = dyn_cast<PHINode>(Op1)) {
if (PN->getParent() == L->getHeader()
&& isa<ConstantInt>(Op0)) {
IndVar = PN;
IndVarIncrement = I;
return;
}
}
if (PHINode *PN = dyn_cast<PHINode>(Op0))
if (PN->getParent() == L->getHeader())
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op1))
if (CI->isOne()) {
IndVar = PN;
IndVarIncrement = I;
return;
}
if (PHINode *PN = dyn_cast<PHINode>(Op1))
if (PN->getParent() == L->getHeader())
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op0))
if (CI->isOne()) {
IndVar = PN;
IndVarIncrement = I;
return;
}
return;
}

46
test/Transforms/LoopIndexSplit/2008-01-28-IndDecrement.ll Normal file
View File

@ -0,0 +1,46 @@
; RUN: llvm-as < %s | opt -loop-index-split -disable-output -stats |& \
; RUN: not grep "loop-index-split"
; Induction variable decrement is not yet handled.
; pr1912.bc
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-f80:128:128"
target triple = "i686-apple-darwin9"
%struct.cset = type { i8*, i8, i8, i32, i8* }
%struct.parse = type { i8*, i8*, i32, i32*, i32, i32, i32, %struct.re_guts*, [10 x i32], [10 x i32] }
%struct.re_guts = type { i32, i32*, i32, i32, %struct.cset*, i8*, i32, i32, i32, i32, i32, i32, i32, i32, i8*, i8*, i32, i32, i32, i32, [1 x i8] }
define fastcc void @p_bracket(%struct.parse* %p) {
entry:
br i1 false, label %bb160, label %bb195
bb160: ; preds = %entry
br i1 false, label %bb.i169, label %bb9.i
bb195: ; preds = %entry
ret void
bb.i169: ; preds = %bb160
br i1 false, label %bb372, label %bb565
bb9.i: ; preds = %bb160
ret void
bb372: ; preds = %bb418, %bb.i169
%i1.0.reg2mem.0 = phi i32 [ %i1.0, %bb418 ], [ 0, %bb.i169 ] ; <i32> [#uses=2]
%tmp3.i.i.i170 = icmp ult i32 %i1.0.reg2mem.0, 128 ; <i1> [#uses=1]
br i1 %tmp3.i.i.i170, label %bb.i.i173, label %bb13.i.i
bb.i.i173: ; preds = %bb372
br label %bb418
bb13.i.i: ; preds = %bb372
br label %bb418
bb418: ; preds = %bb13.i.i, %bb.i.i173
%i1.0 = add i32 %i1.0.reg2mem.0, -1 ; <i32> [#uses=2]
%tmp420 = icmp sgt i32 %i1.0, -1 ; <i1> [#uses=1]
br i1 %tmp420, label %bb372, label %bb565
bb565: ; preds = %bb418, %bb.i169
ret void
}