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compile: double test() {} 

into:

_test:
	fldz
	ret

instead of:

_test:
	subl	$12, %esp
	#IMPLICIT_DEF %xmm0
	movsd	%xmm0, (%esp)
	fldl	(%esp)
	addl	$12, %esp
	ret

llvm-svn: 48213
This commit is contained in:
Chris Lattner 2008-03-11 06:21:08 +00:00
parent a3860a2422
commit 5c7bda440f
1 changed files with 3 additions and 1 deletions
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4
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -1825,8 +1825,10 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
assert(MVT::isFloatingPoint(VT) &&
MVT::isFloatingPoint(Operand.getValueType()) && "Invalid FP cast!");
if (Operand.getValueType() == VT) return Operand; // noop conversion.
if (Operand.getOpcode() == ISD::UNDEF)
return getNode(ISD::UNDEF, VT);
break;
case ISD::SIGN_EXTEND:
case ISD::SIGN_EXTEND:
assert(MVT::isInteger(VT) && MVT::isInteger(Operand.getValueType()) &&
"Invalid SIGN_EXTEND!");
if (Operand.getValueType() == VT) return Operand; // noop extension