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StackColoring: don't clear an instruction's mem operand if the underlying

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object is a PseudoSourceValue and PseudoSourceValue::isConstant returns true (i.e.,
points to memory that has a constant value).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181751 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2013-05-14 01:42:44 +00:00
parent 17a692e7f1
commit dd29df06fa
2 changed files with 44 additions and 0 deletions
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5
lib/CodeGen/StackColoring.cpp
View File

@ -42,6 +42,7 @@
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/DebugInfo.h"
#include "llvm/IR/Function.h"
@ -528,6 +529,10 @@ void StackColoring::remapInstructions(DenseMap<int, int> &SlotRemap) {
if (!V)
continue;
const PseudoSourceValue *PSV = dyn_cast<const PseudoSourceValue>(V);
if (PSV && PSV->isConstant(MFI))
continue;
// Climb up and find the original alloca.
V = GetUnderlyingObject(V);
// If we did not find one, or if the one that we found is not in our

39
test/CodeGen/Mips/stackcoloring.ll Normal file
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@ -0,0 +1,39 @@
; RUN: llc -march=mipsel < %s | FileCheck %s
@g1 = external global i32*
; CHECK: foo1:
; CHECK: lw ${{[0-9]+}}, %got(g1)
; CHECK: # %for.body
; CHECK: # %for.end
define i32 @foo1() {
entry:
%b = alloca [16 x i32], align 4
%0 = bitcast [16 x i32]* %b to i8*
call void @llvm.lifetime.start(i64 64, i8* %0)
%arraydecay = getelementptr inbounds [16 x i32]* %b, i32 0, i32 0
br label %for.body
for.body: ; preds = %for.body, %entry
%i.05 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%v.04 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%1 = load i32** @g1, align 4
%arrayidx = getelementptr inbounds i32* %1, i32 %i.05
%2 = load i32* %arrayidx, align 4
%call = call i32 @foo2(i32 %2, i32* %arraydecay)
%add = add nsw i32 %call, %v.04
%inc = add nsw i32 %i.05, 1
%exitcond = icmp eq i32 %inc, 10000
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
call void @llvm.lifetime.end(i64 64, i8* %0)
ret i32 %add
}
declare void @llvm.lifetime.start(i64, i8* nocapture)
declare i32 @foo2(i32, i32*)
declare void @llvm.lifetime.end(i64, i8* nocapture)