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Give SIToFPInst preference over UIToFPInst because it is faster on platforms that are widely used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59476 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -722,6 +722,23 @@ void IndVarSimplify::OptimizeCanonicalIVType(Loop *L) {
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Incr->eraseFromParent();
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}
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/// Return true if it is OK to use SIToFPInst for an inducation variable
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/// with given inital and exit values.
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static bool useSIToFPInst(ConstantFP &InitV, ConstantFP &ExitV,
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uint64_t intIV, uint64_t intEV) {
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if (InitV.getValueAPF().isNegative() || ExitV.getValueAPF().isNegative())
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return true;
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// If the iteration range can be handled by SIToFPInst then use it.
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APInt Max = APInt::getSignedMaxValue(32);
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if (Max.getZExtValue() > abs(intEV - intIV))
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return true;
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return false;
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}
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/// convertToInt - Convert APF to an integer, if possible.
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static bool convertToInt(const APFloat &APF, uint64_t *intVal) {
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bool isExact = false;
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@ -858,9 +875,9 @@ void IndVarSimplify::HandleFloatingPointIV(Loop *L, PHINode *PH,
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Incr->replaceAllUsesWith(UndefValue::get(Incr->getType()));
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DeadInsts.insert(Incr);
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// Replace floating induction variable.
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if (EV->getValueAPF().isNegative()
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|| InitValue->getValueAPF().isNegative()) {
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// Replace floating induction variable. Give SIToFPInst preference over
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// UIToFPInst because it is faster on platforms that are widely used.
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if (useSIToFPInst(*InitValue, *EV, newInitValue, intEV)) {
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SIToFPInst *Conv = new SIToFPInst(NewPHI, PH->getType(), "indvar.conv",
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PH->getParent()->getFirstNonPHI());
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PH->replaceAllUsesWith(Conv);
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35
test/Transforms/IndVarsSimplify/2008-11-17-Floating.ll
Normal file
35
test/Transforms/IndVarsSimplify/2008-11-17-Floating.ll
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@ -0,0 +1,35 @@
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; RUN: llvm-as < %s | opt -indvars | llvm-dis | grep icmp | count 2
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; RUN: llvm-as < %s | opt -indvars | llvm-dis | grep sitofp | count 1
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; RUN: llvm-as < %s | opt -indvars | llvm-dis | grep uitofp | count 1
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define void @bar() nounwind {
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entry:
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br label %bb
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bb: ; preds = %bb, %entry
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%x.0.reg2mem.0 = phi double [ 0.000000e+00, %entry ], [ %1, %bb ] ; <double> [#uses=2]
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%0 = tail call i32 @foo(double %x.0.reg2mem.0) nounwind ; <i32> [#uses=0]
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%1 = add double %x.0.reg2mem.0, 1.0e+0 ; <double> [#uses=2]
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%2 = fcmp olt double %1, 2147483646.0e+0 ; <i1> [#uses=1]
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br i1 %2, label %bb, label %return
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return: ; preds = %bb
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ret void
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}
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define void @bar1() nounwind {
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entry:
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br label %bb
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bb: ; preds = %bb, %entry
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%x.0.reg2mem.0 = phi double [ 0.000000e+00, %entry ], [ %1, %bb ] ; <double> [#uses=2]
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%0 = tail call i32 @foo(double %x.0.reg2mem.0) nounwind ; <i32> [#uses=0]
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%1 = add double %x.0.reg2mem.0, 1.0e+0 ; <double> [#uses=2]
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%2 = fcmp olt double %1, 2147483647.0e+0 ; <i1> [#uses=1]
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br i1 %2, label %bb, label %return
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return: ; preds = %bb
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ret void
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}
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declare i32 @foo(double)
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