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Handle multiple induction variables.

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This fixes PR714.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42309 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-09-25 18:24:48 +00:00
parent a37c9f7506
commit a6dff2faeb
2 changed files with 73 additions and 7 deletions
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21
lib/Transforms/Scalar/LoopIndexSplit.cpp
View File

@ -676,7 +676,7 @@ bool LoopIndexSplit::safeExitingBlock(SplitInfo &SD,
continue;
// Check if I is induction variable increment instruction.
if (!IndVarIncrement && I->getOpcode() == Instruction::Add) {
if (I->getOpcode() == Instruction::Add) {
Value *Op0 = I->getOperand(0);
Value *Op1 = I->getOperand(1);
@ -685,16 +685,23 @@ bool LoopIndexSplit::safeExitingBlock(SplitInfo &SD,
if ((PN = dyn_cast<PHINode>(Op0))) {
if ((CI = dyn_cast<ConstantInt>(Op1)))
IndVarIncrement = I;
if (CI->isOne()) {
if (!IndVarIncrement && PN == IndVar)
IndVarIncrement = I;
// else this is another loop induction variable
continue;
}
} else
if ((PN = dyn_cast<PHINode>(Op1))) {
if ((CI = dyn_cast<ConstantInt>(Op0)))
IndVarIncrement = I;
if (CI->isOne()) {
if (!IndVarIncrement && PN == IndVar)
IndVarIncrement = I;
// else this is another loop induction variable
continue;
}
}
if (IndVarIncrement && PN == IndVar && CI->isOne())
continue;
}
}
// I is an Exit condition if next instruction is block terminator.
// Exit condition is OK if it compares loop invariant exit value,

59
test/Transforms/LoopIndexSplit/2007-09-25-UpdateIterationSpace-2.ll Normal file
View File

@ -0,0 +1,59 @@
; PR714
; Update loop iteraton space to eliminate condition inside loop.
; RUN: llvm-as < %s | opt -loop-index-split | llvm-dis | not grep bothcond
define void @test(float* %x, i32 %ndat, float** %y, float %xcen, i32 %xmin, i32 %xmax, float %sigmal, float %contribution) {
entry:
%tmp5310 = icmp sgt i32 %xmin, %xmax ; <i1> [#uses=1]
br i1 %tmp5310, label %return, label %bb.preheader
bb.preheader: ; preds = %entry
%tmp3031 = fpext float %contribution to double ; <double> [#uses=1]
%tmp32 = mul double %tmp3031, 5.000000e-01 ; <double> [#uses=1]
%tmp3839 = fpext float %sigmal to double ; <double> [#uses=1]
br label %bb
bb: ; preds = %bb.preheader, %cond_next45
%i.01.0 = phi i32 [ %tmp47, %cond_next45 ], [ %xmin, %bb.preheader ] ; <i32> [#uses=4]
%k.06.0 = phi i32 [ %tmp49, %cond_next45 ], [ 0, %bb.preheader ] ; <i32> [#uses=3]
%tmp2 = icmp sgt i32 %i.01.0, -1 ; <i1> [#uses=1]
%tmp6 = icmp slt i32 %i.01.0, %ndat ; <i1> [#uses=1]
%bothcond = and i1 %tmp2, %tmp6 ; <i1> [#uses=1]
br i1 %bothcond, label %cond_true9, label %cond_next45
cond_true9: ; preds = %bb
%tmp12 = getelementptr float* %x, i32 %i.01.0 ; <float*> [#uses=1]
%tmp13 = load float* %tmp12, align 4 ; <float> [#uses=1]
%tmp15 = sub float %xcen, %tmp13 ; <float> [#uses=1]
%tmp16 = tail call float @fabsf( float %tmp15 ) ; <float> [#uses=1]
%tmp18 = fdiv float %tmp16, %sigmal ; <float> [#uses=1]
%tmp21 = load float** %y, align 4 ; <float*> [#uses=2]
%tmp27 = getelementptr float* %tmp21, i32 %k.06.0 ; <float*> [#uses=1]
%tmp28 = load float* %tmp27, align 4 ; <float> [#uses=1]
%tmp2829 = fpext float %tmp28 to double ; <double> [#uses=1]
%tmp34 = sub float -0.000000e+00, %tmp18 ; <float> [#uses=1]
%tmp3435 = fpext float %tmp34 to double ; <double> [#uses=1]
%tmp36 = tail call double @exp( double %tmp3435 ) ; <double> [#uses=1]
%tmp37 = mul double %tmp32, %tmp36 ; <double> [#uses=1]
%tmp40 = fdiv double %tmp37, %tmp3839 ; <double> [#uses=1]
%tmp41 = add double %tmp2829, %tmp40 ; <double> [#uses=1]
%tmp4142 = fptrunc double %tmp41 to float ; <float> [#uses=1]
%tmp44 = getelementptr float* %tmp21, i32 %k.06.0 ; <float*> [#uses=1]
store float %tmp4142, float* %tmp44, align 4
br label %cond_next45
cond_next45: ; preds = %bb, %cond_true9
%tmp47 = add i32 %i.01.0, 1 ; <i32> [#uses=2]
%tmp49 = add i32 %k.06.0, 1 ; <i32> [#uses=1]
%tmp53 = icmp sgt i32 %tmp47, %xmax ; <i1> [#uses=1]
br i1 %tmp53, label %return.loopexit, label %bb
return.loopexit: ; preds = %cond_next45
br label %return
return: ; preds = %return.loopexit, %entry
ret void
}
declare float @fabsf(float)
declare double @exp(double)