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[PowerPC] FastISel can't handle i1 return values when using CR bits

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Under normal circumstances, use of CR bits is disabled when running at -O0, but
it is enabled by default otherwise, and if you have optnone functions, they'll
still generally be generated with crbits turned on (because nothing else turns
them off). FastISel can't handle most things dealing with i1 values when using
CR bits, and checks for that, but was not checking the return type on
functions; we can't fast-isel function calls with i1 return values either when
using CR bits for boolean values.

Fixes PR22664.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233775 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2015-04-01 00:40:48 +00:00
parent 06c06df4de
commit 54ab6ce385
2 changed files with 40 additions and 0 deletions
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3
lib/Target/PowerPC/PPCFastISel.cpp
View File

@ -1444,6 +1444,9 @@ bool PPCFastISel::fastLowerCall(CallLoweringInfo &CLI) {
else if (!isTypeLegal(RetTy, RetVT) && RetVT != MVT::i16 &&
RetVT != MVT::i8)
return false;
else if (RetVT == MVT::i1 && PPCSubTarget->useCRBits())
// We can't handle boolean returns when CR bits are in use.
return false;
// FIXME: No multi-register return values yet.
if (RetVT != MVT::isVoid && RetVT != MVT::i8 && RetVT != MVT::i16 &&

37
test/CodeGen/PowerPC/optnone-crbits-i1-ret.ll Normal file
View File

@ -0,0 +1,37 @@
; RUN: llc < %s | FileCheck %s
target datalayout = "E-m:e-i64:64-n32:64"
target triple = "powerpc64-bgq-linux"
declare zeroext i1 @ri1()
declare void @se1()
declare void @se2()
define void @test() #0 {
entry:
%b = call zeroext i1 @ri1()
br label %next
; CHECK-LABEL: @test
; CHECK: bl ri1
; CHECK-NEXT: nop
; CHECK: andi. 3, 3, 1
next:
br i1 %b, label %case1, label %case2
case1:
call void @se1()
br label %end
case2:
call void @se2()
br label %end
end:
ret void
; CHECK: blr
}
attributes #0 = { noinline optnone }