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PPC32 cannot form counter loops around i64 FP conversions

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On PPC32, i64 FP conversions are implemented using runtime calls (which clobber
the counter register). These must be excluded.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182023 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2013-05-16 16:52:41 +00:00
parent 3e521a5223
commit 2a5e8c328e
2 changed files with 33 additions and 1 deletions
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6
lib/Target/PowerPC/PPCCTRLoops.cpp
View File

@ -305,7 +305,11 @@ bool PPCCTRLoops::convertToCTRLoop(Loop *L) {
isa<FPToUIInst>(J) || isa<FPToSIInst>(J)) {
CastInst *CI = cast<CastInst>(J);
if (CI->getSrcTy()->getScalarType()->isPPC_FP128Ty() ||
CI->getDestTy()->getScalarType()->isPPC_FP128Ty())
CI->getDestTy()->getScalarType()->isPPC_FP128Ty() ||
(TT.isArch32Bit() &&
(CI->getSrcTy()->getScalarType()->isIntegerTy(64) ||
CI->getDestTy()->getScalarType()->isIntegerTy(64))
))
return MadeChange;
} else if (isa<IndirectBrInst>(J) || isa<InvokeInst>(J)) {
// On PowerPC, indirect jumps use the counter register.

28
test/CodeGen/PowerPC/ctrloop-fp64.ll Normal file
View File

@ -0,0 +1,28 @@
; RUN: llc < %s -mcpu=generic | FileCheck %s
target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32"
target triple = "powerpc-unknown-linux-gnu"
define i64 @foo(double* nocapture %n) nounwind readonly {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.06 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%x.05 = phi i64 [ 0, %entry ], [ %conv1, %for.body ]
%arrayidx = getelementptr inbounds double* %n, i32 %i.06
%0 = load double* %arrayidx, align 8
%conv = sitofp i64 %x.05 to double
%add = fadd double %conv, %0
%conv1 = fptosi double %add to i64
%inc = add nsw i32 %i.06, 1
%exitcond = icmp eq i32 %inc, 2048
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret i64 %conv1
}
; CHECK: @foo
; CHECK-NOT: mtctr