mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 18:29:46 +00:00
teach libanalysis to simplify vector loads with bitcast sources. This
implements something out of Target/README.txt producing: _foo: ## @foo movl 4(%esp), %eax movapd LCPI1_0, %xmm0 movapd %xmm0, (%eax) ret $4 instead of: _foo: ## @foo movl 4(%esp), %eax movapd _b, %xmm0 mulpd LCPI1_0, %xmm0 addpd _a, %xmm0 movapd %xmm0, (%eax) ret $4 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84942 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
739208a790
commit
17f0cd3cc1
@ -210,24 +210,30 @@ static bool ReadDataFromGlobal(Constant *C, uint64_t ByteOffset,
|
||||
|
||||
static Constant *FoldReinterpretLoadFromConstPtr(Constant *C,
|
||||
const TargetData &TD) {
|
||||
const Type *InitializerTy = cast<PointerType>(C->getType())->getElementType();
|
||||
const IntegerType *IntType = dyn_cast<IntegerType>(InitializerTy);
|
||||
const Type *LoadTy = cast<PointerType>(C->getType())->getElementType();
|
||||
const IntegerType *IntType = dyn_cast<IntegerType>(LoadTy);
|
||||
|
||||
// If this isn't an integer load we can't fold it directly.
|
||||
if (!IntType) {
|
||||
// If this is a float/double load, we can try folding it as an int32/64 load
|
||||
// and then bitcast the result. This can be useful for union cases.
|
||||
// and then bitcast the result. This can be useful for union cases. Note
|
||||
// that address spaces don't matter here since we're not going to result in
|
||||
// an actual new load.
|
||||
const Type *MapTy;
|
||||
if (InitializerTy->isFloatTy())
|
||||
if (LoadTy->isFloatTy())
|
||||
MapTy = Type::getInt32PtrTy(C->getContext());
|
||||
else if (InitializerTy->isDoubleTy())
|
||||
else if (LoadTy->isDoubleTy())
|
||||
MapTy = Type::getInt64PtrTy(C->getContext());
|
||||
else
|
||||
else if (isa<VectorType>(LoadTy)) {
|
||||
MapTy = IntegerType::get(C->getContext(),
|
||||
TD.getTypeAllocSizeInBits(LoadTy));
|
||||
MapTy = PointerType::getUnqual(MapTy);
|
||||
} else
|
||||
return 0;
|
||||
|
||||
C = ConstantExpr::getBitCast(C, MapTy);
|
||||
if (Constant *Res = FoldReinterpretLoadFromConstPtr(C, TD))
|
||||
return ConstantExpr::getBitCast(Res, InitializerTy);
|
||||
return ConstantExpr::getBitCast(Res, LoadTy);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
@ -77,3 +77,13 @@ define i128 @test9() {
|
||||
; @test9
|
||||
; CHECK: ret i128 112312312
|
||||
}
|
||||
|
||||
; vector load.
|
||||
define <2 x i64> @test10() {
|
||||
%r = load <2 x i64>* bitcast({i64, i64}* @test3 to <2 x i64>*)
|
||||
ret <2 x i64> %r
|
||||
|
||||
; @test10
|
||||
; CHECK: ret <2 x i64> <i64 112312312, i64 0>
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user