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Turn altivec lvx/stvx intrinsics into loads and stores. This allows the

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elimination of one load from this:

int AreSecondAndThirdElementsBothNegative( vector float *in ) {
#define QNaN 0x7FC00000
const vector unsigned int testData = (vector unsigned int)( QNaN, 0, 0, QNaN );
vector float test = vec_ld( 0, (float*) &testData );
return ! vec_any_ge( test, *in );
}

Now generating:

_AreSecondAndThirdElementsBothNegative:
        mfspr r2, 256
        oris r4, r2, 49152
        mtspr 256, r4
        li r4, lo16(LCPI1_0)
        lis r5, ha16(LCPI1_0)
        addi r6, r1, -16
        lvx v0, r5, r4
        stvx v0, 0, r6
        lvx v1, 0, r3
        vcmpgefp. v0, v0, v1
        mfcr r3, 2
        rlwinm r3, r3, 27, 31, 31
        xori r3, r3, 1
        cntlzw r3, r3
        srwi r3, r3, 5
        mtspr 256, r2
        blr


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27352 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-04-02 05:30:25 +00:00
parent 02b72556d7
commit 82ed58f9c4
1 changed files with 22 additions and 0 deletions
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lib/Transforms/Scalar/InstructionCombining.cpp
+22
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@@ -5437,6 +5437,28 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
} else {
switch (II->getIntrinsicID()) {
default: break;
case Intrinsic::ppc_altivec_lvx:
case Intrinsic::ppc_altivec_lvxl:
// Turn lvx -> load if the pointer is known aligned.
if (GetKnownAlignment(II->getOperand(1), TD) >= 16) {
Instruction *Ptr = new CastInst(II->getOperand(1),
PointerType::get(II->getType()), "tmp");
InsertNewInstBefore(Ptr, CI);
return new LoadInst(Ptr);
}
break;
case Intrinsic::ppc_altivec_stvx:
case Intrinsic::ppc_altivec_stvxl:
// Turn stvx -> store if the pointer is known aligned.
if (GetKnownAlignment(II->getOperand(2), TD) >= 16) {
const Type *OpTy = II->getOperand(1)->getType();
Instruction *Ptr = new CastInst(II->getOperand(2),
PointerType::get(OpTy), "tmp");
InsertNewInstBefore(Ptr, CI);
return new StoreInst(II->getOperand(1), Ptr);
}
break;
case Intrinsic::stackrestore: {
// If the save is right next to the restore, remove the restore. This can
// happen when variable allocas are DCE'd.