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[ARM] Fix PR32130: Handle promotion of zero sized constants.

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The special case of zero sized values was previously not handled correctly.
This patch handles this by not promoting if the size is zero.

Patch by Tim Neumann.

Differential Revision: https://reviews.llvm.org/D31116

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@298320 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vadzim Dambrouski 2017-03-20 22:59:57 +00:00
parent 1f5f67010f
commit a734e28872
2 changed files with 11 additions and 1 deletions
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3
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -3063,7 +3063,8 @@ static SDValue promoteToConstantPool(const GlobalValue *GV, SelectionDAG &DAG,
unsigned RequiredPadding = 4 - (Size % 4);
bool PaddingPossible =
RequiredPadding == 4 || (CDAInit && CDAInit->isString());
if (!PaddingPossible || Align > 4 || Size > ConstpoolPromotionMaxSize)
if (!PaddingPossible || Align > 4 || Size > ConstpoolPromotionMaxSize ||
Size == 0)
return SDValue();
unsigned PaddedSize = Size + ((RequiredPadding == 4) ? 0 : RequiredPadding);

9
test/CodeGen/ARM/constantpool-promote.ll
View File

@ -21,6 +21,7 @@
@.arr3 = private unnamed_addr constant [2 x i16*] [i16* null, i16* null], align 4
@.ptr = private unnamed_addr constant [2 x i16*] [i16* getelementptr inbounds ([2 x i16], [2 x i16]* @.arr2, i32 0, i32 0), i16* null], align 2
@.arr4 = private unnamed_addr constant [2 x i16] [i16 3, i16 4], align 16
@.zerosize = private unnamed_addr constant [0 x i16] zeroinitializer, align 4
; CHECK-LABEL: @test1
; CHECK: adr r0, [[x:.*]]
@ -139,6 +140,14 @@ define void @test9() #0 {
ret void
}
; Ensure that zero sized values are supported / not promoted.
; CHECK-LABEL: @pr32130
; CHECK-NOT: adr
define void @pr32130() #0 {
tail call void @c(i16* getelementptr inbounds ([0 x i16], [0 x i16]* @.zerosize, i32 0, i32 0)) #2
ret void
}
; CHECK-LABEL: @test10
; CHECK-V6M: adr r{{[0-9]*}}, [[x:.*]]
; CHECK-V6M: [[x]]: