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Fix ARMGlobalMerge pass to check if globals are entirely within range.

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It is generally not sufficient to check if the starting offset is in range
of the maximum offset that can be efficiently used for the target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119565 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2010-11-17 21:25:36 +00:00
parent 72831dc905
commit 619a372617
2 changed files with 11 additions and 2 deletions
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7
lib/Target/ARM/ARMGlobalMerge.cpp
View File

@ -129,11 +129,14 @@ bool ARMGlobalMerge::doMerge(SmallVectorImpl<GlobalVariable*> &Globals,
uint64_t MergedSize = 0;
std::vector<const Type*> Tys;
std::vector<Constant*> Inits;
for (j = i; MergedSize < MaxOffset && j != e; ++j) {
for (j = i; j != e; ++j) {
const Type *Ty = Globals[j]->getType()->getElementType();
MergedSize += TD->getTypeAllocSize(Ty);
if (MergedSize > MaxOffset) {
break;
}
Tys.push_back(Ty);
Inits.push_back(Globals[j]->getInitializer());
MergedSize += TD->getTypeAllocSize(Ty);
}
StructType *MergedTy = StructType::get(M.getContext(), Tys);

6
test/CodeGen/ARM/global-merge.ll
View File

@ -9,3 +9,9 @@
; CHECK: _MergedGlobals:
@g1 = internal global i32 1
@g2 = internal global i32 2
; Make sure that the complete variable fits within the range of the maximum
; offset. Having the starting offset in range is not sufficient.
; When this works properly, @g3 is placed in a separate chunk of merged globals.
; CHECK: _MergedGlobals1:
@g3 = internal global [30 x i32] [ i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10 ]