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Account for 128-bit integer operations in PPCCTRLoops

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We need to abort the formation of counter-register-based loops where there are
128-bit integer operations that might become function calls.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202192 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2014-02-25 20:51:50 +00:00
parent 724e528fc2
commit 15ac7dfb90
2 changed files with 42 additions and 6 deletions
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17
lib/Target/PowerPC/PPCCTRLoops.cpp
View File

@ -187,6 +187,13 @@ bool PPCCTRLoops::runOnFunction(Function &F) {
return MadeChange; return MadeChange;
} }
static bool isLargeIntegerTy(bool Is32Bit, Type *Ty) {
if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
return ITy->getBitWidth() > (Is32Bit ? 32 : 64);
return false;
}
bool PPCCTRLoops::mightUseCTR(const Triple &TT, BasicBlock *BB) { bool PPCCTRLoops::mightUseCTR(const Triple &TT, BasicBlock *BB) {
for (BasicBlock::iterator J = BB->begin(), JE = BB->end(); for (BasicBlock::iterator J = BB->begin(), JE = BB->end();
J != JE; ++J) { J != JE; ++J) {
@ -353,13 +360,11 @@ bool PPCCTRLoops::mightUseCTR(const Triple &TT, BasicBlock *BB) {
CastInst *CI = cast<CastInst>(J); CastInst *CI = cast<CastInst>(J);
if (CI->getSrcTy()->getScalarType()->isPPC_FP128Ty() || if (CI->getSrcTy()->getScalarType()->isPPC_FP128Ty() ||
CI->getDestTy()->getScalarType()->isPPC_FP128Ty() || CI->getDestTy()->getScalarType()->isPPC_FP128Ty() ||
(TT.isArch32Bit() && isLargeIntegerTy(TT.isArch32Bit(), CI->getSrcTy()->getScalarType()) ||
(CI->getSrcTy()->getScalarType()->isIntegerTy(64) || isLargeIntegerTy(TT.isArch32Bit(), CI->getDestTy()->getScalarType()))
CI->getDestTy()->getScalarType()->isIntegerTy(64))
))
return true; return true;
} else if (TT.isArch32Bit() && } else if (isLargeIntegerTy(TT.isArch32Bit(),
J->getType()->getScalarType()->isIntegerTy(64) && J->getType()->getScalarType()) &&
(J->getOpcode() == Instruction::UDiv || (J->getOpcode() == Instruction::UDiv ||
J->getOpcode() == Instruction::SDiv || J->getOpcode() == Instruction::SDiv ||
J->getOpcode() == Instruction::URem || J->getOpcode() == Instruction::URem ||

31
test/CodeGen/PowerPC/ctrloop-udivti3.ll Normal file
View File

@ -0,0 +1,31 @@
; RUN: llc < %s -march=ppc64 | FileCheck %s
target datalayout = "E-m:e-i64:64-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
; Function Attrs: nounwind
define hidden void @_mpd_shortdiv(i64 %n) #0 {
entry:
br i1 undef, label %for.end, label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body, %for.body.lr.ph
%i.018.in = phi i64 [ %n, %for.body.lr.ph ], [ %i.018, %for.body ]
%i.018 = add i64 %i.018.in, -1
%add.i = or i128 undef, undef
%div.i = udiv i128 %add.i, 0
%conv3.i11 = trunc i128 %div.i to i64
store i64 %conv3.i11, i64* undef, align 8
%cmp = icmp eq i64 %i.018, 0
br i1 %cmp, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
}
; CHECK-LABEL: @_mpd_shortdiv
; CHECK-NOT: mtctr
attributes #0 = { nounwind }