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[PowerPC] On PPC32, 128-bit shifts might be runtime calls 

The counter-loops formation pass needs to know what operations might be
function calls (because they can't appear in counter-based loops). On PPC32,
128-bit shifts might be runtime calls (even though you can't use __int128 on
PPC32, it seems that SROA might form them).

Fixes PR19709.

llvm-svn: 208501
This commit is contained in:
Hal Finkel 2014-05-11 16:23:29 +00:00
parent 60cae1ba49
commit c4c6c87666
2 changed files with 80 additions and 0 deletions
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8
llvm/lib/Target/PowerPC/PPCCTRLoops.cpp
View File

@ -370,6 +370,14 @@ bool PPCCTRLoops::mightUseCTR(const Triple &TT, BasicBlock *BB) {
J->getOpcode() == Instruction::URem ||
J->getOpcode() == Instruction::SRem)) {
return true;
} else if (TT.isArch32Bit() &&
isLargeIntegerTy(false, J->getType()->getScalarType()) &&
(J->getOpcode() == Instruction::Shl ||
J->getOpcode() == Instruction::AShr ||
J->getOpcode() == Instruction::LShr)) {
// Only on PPC32, for 128-bit integers (specifically not 64-bit
// integers), these might be runtime calls.
return true;
} else if (isa<IndirectBrInst>(J) || isa<InvokeInst>(J)) {
// On PowerPC, indirect jumps use the counter register.
return true;

72
llvm/test/CodeGen/PowerPC/ctrloop-sh.ll Normal file
View File

@ -0,0 +1,72 @@
; RUN: llc < %s | FileCheck %s
target datalayout = "E-m:e-p:32:32-i128:64-n32"
target triple = "powerpc-ellcc-linux"
; Function Attrs: nounwind
define void @foo1(i128* %a, i128* readonly %b, i128* readonly %c) #0 {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%0 = load i128* %b, align 16
%1 = load i128* %c, align 16
%shl = shl i128 %0, %1
store i128 %shl, i128* %a, align 16
%inc = add nsw i32 %i.02, 1
%exitcond = icmp eq i32 %inc, 2048
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
; CHECK-LABEL: @foo1
; CHECK-NOT: mtctr
}
; Function Attrs: nounwind
define void @foo2(i128* %a, i128* readonly %b, i128* readonly %c) #0 {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%0 = load i128* %b, align 16
%1 = load i128* %c, align 16
%shl = ashr i128 %0, %1
store i128 %shl, i128* %a, align 16
%inc = add nsw i32 %i.02, 1
%exitcond = icmp eq i32 %inc, 2048
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
; CHECK-LABEL: @foo2
; CHECK-NOT: mtctr
}
; Function Attrs: nounwind
define void @foo3(i128* %a, i128* readonly %b, i128* readonly %c) #0 {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%i.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%0 = load i128* %b, align 16
%1 = load i128* %c, align 16
%shl = lshr i128 %0, %1
store i128 %shl, i128* %a, align 16
%inc = add nsw i32 %i.02, 1
%exitcond = icmp eq i32 %inc, 2048
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
; CHECK-LABEL: @foo3
; CHECK-NOT: mtctr
}
attributes #0 = { nounwind }