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handle the constant case of vector insertion. For something

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like this:

struct S { float A, B, C, D; };

struct S g;
struct S bar() { 
  struct S A = g;
  ++A.B;
  A.A = 42;
  return A;
}

we now generate:

_bar:                                   ## @bar
## BB#0:                                ## %entry
	movq	_g@GOTPCREL(%rip), %rax
	movss	12(%rax), %xmm0
	pshufd	$16, %xmm0, %xmm0
	movss	4(%rax), %xmm2
	movss	8(%rax), %xmm1
	pshufd	$16, %xmm1, %xmm1
	unpcklps	%xmm0, %xmm1
	addss	LCPI1_0(%rip), %xmm2
	pshufd	$16, %xmm2, %xmm2
	movss	LCPI1_1(%rip), %xmm0
	pshufd	$16, %xmm0, %xmm0
	unpcklps	%xmm2, %xmm0
	ret

instead of:

_bar:                                   ## @bar
## BB#0:                                ## %entry
	movq	_g@GOTPCREL(%rip), %rax
	movss	12(%rax), %xmm0
	pshufd	$16, %xmm0, %xmm0
	movss	4(%rax), %xmm2
	movss	8(%rax), %xmm1
	pshufd	$16, %xmm1, %xmm1
	unpcklps	%xmm0, %xmm1
	addss	LCPI1_0(%rip), %xmm2
	movd	%xmm2, %eax
	shlq	$32, %rax
	addq	$1109917696, %rax       ## imm = 0x42280000
	movd	%rax, %xmm0
	ret



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112345 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-08-28 01:50:57 +00:00
parent 75ebbceeed
commit 7900779543
2 changed files with 44 additions and 3 deletions
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35
lib/Transforms/InstCombine/InstCombineCasts.cpp
View File

@ -1366,7 +1366,7 @@ static bool isMultipleOfTypeSize(unsigned Value, const Type *Ty) {
return Value % Ty->getPrimitiveSizeInBits() == 0;
}
static bool getTypeSizeIndex(unsigned Value, const Type *Ty) {
static unsigned getTypeSizeIndex(unsigned Value, const Type *Ty) {
return Value / Ty->getPrimitiveSizeInBits();
}
@ -1384,6 +1384,11 @@ static bool CollectInsertionElements(Value *V, unsigned ElementIndex,
// If we got down to a value of the right type, we win, try inserting into the
// right element.
if (V->getType() == VecEltTy) {
// Inserting null doesn't actually insert any elements.
if (Constant *C = dyn_cast<Constant>(V))
if (C->isNullValue())
return true;
// Fail if multiple elements are inserted into this slot.
if (ElementIndex >= Elements.size() || Elements[ElementIndex] != 0)
return false;
@ -1392,10 +1397,34 @@ static bool CollectInsertionElements(Value *V, unsigned ElementIndex,
return true;
}
//if (Constant *C = dyn_cast<Constant>(V)) {
if (Constant *C = dyn_cast<Constant>(V)) {
// Figure out the # elements this provides, and bitcast it or slice it up
// as required.
//}
unsigned NumElts = getTypeSizeIndex(C->getType()->getPrimitiveSizeInBits(),
VecEltTy);
// If the constant is the size of a vector element, we just need to bitcast
// it to the right type so it gets properly inserted.
if (NumElts == 1)
return CollectInsertionElements(ConstantExpr::getBitCast(C, VecEltTy),
ElementIndex, Elements, VecEltTy);
// Okay, this is a constant that covers multiple elements. Slice it up into
// pieces and insert each element-sized piece into the vector.
if (!isa<IntegerType>(C->getType()))
C = ConstantExpr::getBitCast(C, IntegerType::get(V->getContext(),
C->getType()->getPrimitiveSizeInBits()));
unsigned ElementSize = VecEltTy->getPrimitiveSizeInBits();
const Type *ElementIntTy = IntegerType::get(C->getContext(), ElementSize);
for (unsigned i = 0; i != NumElts; ++i) {
Constant *Piece = ConstantExpr::getLShr(C, ConstantInt::get(C->getType(),
i*ElementSize));
Piece = ConstantExpr::getTrunc(Piece, ElementIntTy);
if (!CollectInsertionElements(Piece, ElementIndex+i, Elements, VecEltTy))
return false;
}
return true;
}
if (!V->hasOneUse()) return false;

12
test/Transforms/InstCombine/bitcast.ll
View File

@ -91,3 +91,15 @@ define <2 x float> @test5(float %A, float %B) {
; CHECK-NEXT: insertelement <2 x float> {{.*}}, float %B, i32 1
; CHECK-NEXT: ret <2 x float>
}
define <2 x float> @test6(float %A){
%tmp23 = bitcast float %A to i32 ; <i32> [#uses=1]
%tmp24 = zext i32 %tmp23 to i64 ; <i64> [#uses=1]
%tmp25 = shl i64 %tmp24, 32 ; <i64> [#uses=1]
%mask20 = or i64 %tmp25, 1109917696 ; <i64> [#uses=1]
%tmp35 = bitcast i64 %mask20 to <2 x float> ; <<2 x float>> [#uses=1]
ret <2 x float> %tmp35
; CHECK: @test6
; CHECK-NEXT: insertelement <2 x float> <float 4.200000e+01, float undef>, float %A, i32 1
; CHECK: ret
}