wine/gecko
0
0
Fork 0
mirror of https://gitlab.winehq.org/wine/wine-gecko.git synced 2024-09-13 09:24:08 -07:00
Code Issues Packages Projects Releases Wiki Activity

Bug 592631: fast path for x|0, r=dvander

Browse Source
This commit is contained in:
Jan de Mooij 2010-09-08 18:23:27 -07:00
parent 161faa4b9d
commit 8b137e037b
1 changed files with 35 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
js/src/methodjit/FastOps.cpp
View File

@ -340,6 +340,41 @@ mjit::Compiler::jsop_bitop(JSOp op)
return;
}
bool lhsIntOrDouble = !(lhs->isNotType(JSVAL_TYPE_DOUBLE) &&
lhs->isNotType(JSVAL_TYPE_INT32));
/* Fast-path double to int conversion. */
if (!lhs->isConstant() && rhs->isConstant() && lhsIntOrDouble &&
rhs->isType(JSVAL_TYPE_INT32) && rhs->getValue().toInt32() == 0 &&
(op == JSOP_BITOR || op == JSOP_LSH)) {
RegisterID reg = frame.copyDataIntoReg(lhs);
if (lhs->isType(JSVAL_TYPE_INT32)) {
frame.popn(2);
frame.pushTypedPayload(JSVAL_TYPE_INT32, reg);
return;
}
MaybeJump isInt;
if (!lhs->isType(JSVAL_TYPE_DOUBLE)) {
RegisterID typeReg = frame.tempRegForType(lhs);
isInt = masm.testInt32(Assembler::Equal, typeReg);
Jump notDouble = masm.testDouble(Assembler::NotEqual, typeReg);
stubcc.linkExit(notDouble, Uses(2));
}
frame.loadDouble(lhs, FPRegisters::First, masm);
Jump truncateGuard = masm.branchTruncateDoubleToInt32(FPRegisters::First, reg);
stubcc.linkExit(truncateGuard, Uses(2));
stubcc.leave();
stubcc.call(stub);
if (isInt.isSet())
isInt.get().linkTo(masm.label(), &masm);
frame.popn(2);
frame.pushTypedPayload(JSVAL_TYPE_INT32, reg);
stubcc.rejoin(Changes(1));
return;
}
/* We only want to handle integers here. */
if (rhs->isNotType(JSVAL_TYPE_INT32) || lhs->isNotType(JSVAL_TYPE_INT32) ||
(op == JSOP_URSH && rhs->isConstant() && rhs->getValue().toInt32() % 32 == 0)) {