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Don't track max alignment during stack object allocations since they can be deleted later. Let PEI compute it.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47668 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-02-27 10:04:56 +00:00
parent e90a615f37
commit be680dcea6
3 changed files with 34 additions and 6 deletions
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4
include/llvm/CodeGen/MachineFrameInfo.h
View File

@ -305,9 +305,6 @@ public:
/// a postive identifier to represent it.
///
int CreateStackObject(uint64_t Size, unsigned Alignment) {
// Keep track of the maximum alignment.
if (MaxAlignment < Alignment) MaxAlignment = Alignment;
assert(Size != 0 && "Cannot allocate zero size stack objects!");
Objects.push_back(StackObject(Size, Alignment, -1));
return Objects.size()-NumFixedObjects-1;
@ -331,7 +328,6 @@ public:
///
int CreateVariableSizedObject() {
HasVarSizedObjects = true;
if (MaxAlignment < 1) MaxAlignment = 1;
Objects.push_back(StackObject(0, 1, -1));
return Objects.size()-NumFixedObjects-1;
}

3
lib/CodeGen/PrologEpilogInserter.cpp
View File

@ -475,8 +475,7 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
// Remember the required stack alignment in case targets need it to perform
// dynamic stack alignment.
assert(FFI->getMaxAlignment() == MaxAlign &&
"Stack alignment calculation broken!");
FFI->setMaxAlignment(MaxAlign);
}

33
test/CodeGen/X86/2008-02-27-PEICrash.ll Normal file
View File

@ -0,0 +1,33 @@
; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2
define i64 @__divsc3(float %a, float %b, float %c, float %d) nounwind readnone {
entry:
br i1 false, label %bb56, label %bb33
bb33: ; preds = %entry
br label %bb56
bb56: ; preds = %bb33, %entry
%tmp36.pn = phi float [ 0.000000e+00, %bb33 ], [ 0.000000e+00, %entry ] ; <float> [#uses=1]
%b.pn509 = phi float [ %b, %bb33 ], [ %a, %entry ] ; <float> [#uses=1]
%a.pn = phi float [ %a, %bb33 ], [ %b, %entry ] ; <float> [#uses=1]
%tmp41.pn508 = phi float [ 0.000000e+00, %bb33 ], [ 0.000000e+00, %entry ] ; <float> [#uses=1]
%tmp51.pn = phi float [ 0.000000e+00, %bb33 ], [ %a, %entry ] ; <float> [#uses=1]
%tmp44.pn = mul float %tmp36.pn, %b.pn509 ; <float> [#uses=1]
%tmp46.pn = add float %tmp44.pn, %a.pn ; <float> [#uses=1]
%tmp53.pn = sub float 0.000000e+00, %tmp51.pn ; <float> [#uses=1]
%x.0 = fdiv float %tmp46.pn, %tmp41.pn508 ; <float> [#uses=1]
%y.0 = fdiv float %tmp53.pn, 0.000000e+00 ; <float> [#uses=1]
br i1 false, label %bb433, label %bb98
bb98: ; preds = %bb56
%tmp102 = mul float 0.000000e+00, %a ; <float> [#uses=1]
%tmp106 = mul float 0.000000e+00, %b ; <float> [#uses=1]
br label %bb433
bb433: ; preds = %bb98, %bb56
%x.1 = phi float [ %tmp102, %bb98 ], [ %x.0, %bb56 ] ; <float> [#uses=0]
%y.1 = phi float [ %tmp106, %bb98 ], [ %y.0, %bb56 ] ; <float> [#uses=1]
%tmp460 = add float %y.1, 0.000000e+00 ; <float> [#uses=0]
ret i64 0
}