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Massive rewrite of MMX:

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The x86_mmx type is used for MMX intrinsics, parameters and
return values where these use MMX registers, and is also
supported in load, store, and bitcast.

Only the above operations generate MMX instructions, and optimizations
do not operate on or produce MMX intrinsics. 

MMX-sized vectors <2 x i32> etc. are lowered to XMM or split into
smaller pieces.  Optimizations may occur on these forms and the
result casted back to x86_mmx, provided the result feeds into a
previous existing x86_mmx operation.

The point of all this is prevent optimizations from introducing
MMX operations, which is unsafe due to the EMMS problem.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115243 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2010-09-30 23:57:10 +00:00
parent a7e3b56477
commit 0488fb649a
40 changed files with 1433 additions and 1192 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
lib/Transforms/IPO/DeadArgumentElimination.cpp
View File

@@ -791,7 +791,8 @@ bool DAE::RemoveDeadStuffFromFunction(Function *F) {
} else if (New->getType()->isVoidTy()) {
// Our return value has uses, but they will get removed later on.
// Replace by null for now.
Call->replaceAllUsesWith(Constant::getNullValue(Call->getType()));
if (!Call->getType()->isX86_MMXTy())
Call->replaceAllUsesWith(Constant::getNullValue(Call->getType()));
} else {
assert(RetTy->isStructTy() &&
"Return type changed, but not into a void. The old return type"
@@ -854,7 +855,8 @@ bool DAE::RemoveDeadStuffFromFunction(Function *F) {
} else {
// If this argument is dead, replace any uses of it with null constants
// (these are guaranteed to become unused later on).
I->replaceAllUsesWith(Constant::getNullValue(I->getType()));
if (!I->getType()->isX86_MMXTy())
I->replaceAllUsesWith(Constant::getNullValue(I->getType()));
}
// If we change the return value of the function we must rewrite any return

6
lib/Transforms/Scalar/ScalarReplAggregates.cpp
View File

@@ -321,6 +321,9 @@ bool ConvertToScalarInfo::CanConvertToScalar(Value *V, uint64_t Offset) {
// Don't break volatile loads.
if (LI->isVolatile())
return false;
// Don't touch MMX operations.
if (LI->getType()->isX86_MMXTy())
return false;
MergeInType(LI->getType(), Offset);
continue;
}
@@ -328,6 +331,9 @@ bool ConvertToScalarInfo::CanConvertToScalar(Value *V, uint64_t Offset) {
if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
// Storing the pointer, not into the value?
if (SI->getOperand(0) == V || SI->isVolatile()) return false;
// Don't touch MMX operations.
if (SI->getOperand(0)->getType()->isX86_MMXTy())
return false;
MergeInType(SI->getOperand(0)->getType(), Offset);
continue;
}