Do not emit double values at their use sites.

Revert part of r14179. From the regression test's comment:

Currently, the gap resolver doesn't handle moves from a ConstantOperand to a
DoubleRegister, but these kind of moves appeared when HConstant::EmitAtUses
was changed to allow special double values (-0, NaN, hole). So we should
either enhance the gap resolver or make sure that such moves don't happen.

BUG=chrome:234101

Review URL: https://codereview.chromium.org/14429002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14394 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
parent c46cbcce
......@@ -3288,9 +3288,7 @@ class HConstant: public HTemplateInstruction<0> {
return has_int32_value_;
}
virtual bool EmitAtUses() {
return !representation().IsDouble() || IsSpecialDouble();
}
virtual bool EmitAtUses() { return !representation().IsDouble(); }
virtual void PrintDataTo(StringStream* stream);
virtual HType CalculateInferredType();
bool IsInteger() { return handle()->IsSmi(); }
......
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// Flags: --allow-natives-syntax
// Currently, the gap resolver doesn't handle moves from a ConstantOperand to a
// DoubleRegister, but these kind of moves appeared when HConstant::EmitAtUses
// was changed to allow special double values (-0, NaN, hole). So we should
// either enhance the gap resolver or make sure that such moves don't happen.
function foo(x) {
return (x ? NaN : 0.2) + 0.1;
}
foo(false);
foo(false);
%OptimizeFunctionOnNextCall(foo);
foo(false);
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