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Fixed register allocation bug in x64 backend (bug 516093, r=gal).

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This commit is contained in:
David Anderson 2009-09-11 18:31:12 -07:00
parent cfdd0c20d7
commit 04069b3bf5
1 changed files with 23 additions and 3 deletions
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26
js/src/nanojit/NativeX64.cpp
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@ -277,6 +277,9 @@ namespace nanojit
// register allocation for 2-address style ops of the form R = R (op) B
void Assembler::regalloc_binary(LIns *ins, RegisterMask allow, Register &rr, Register &ra, Register &rb) {
#ifdef _DEBUG
RegisterMask originalAllow = allow;
#endif
rb = UnknownReg;
LIns *a = ins->oprnd1();
LIns *b = ins->oprnd2();
@ -289,12 +292,21 @@ namespace nanojit
// if this is last use of a in reg, we can re-use result reg
if (rA == 0 || (ra = rA->reg) == UnknownReg) {
ra = findSpecificRegFor(a, rr);
} else {
// rA already has a register assigned
} else if (!(allow & rmask(ra))) {
// rA already has a register assigned, but it's not valid
// to make sure floating point operations stay in FPU registers
// as much as possible, make sure that only a few opcodes are
// reserving GPRs.
NanoAssert(a->opcode() == LIR_quad || a->opcode() == LIR_ldq);
allow &= ~rmask(rr);
ra = findRegFor(a, allow);
}
if (a == b) {
rb = ra;
}
NanoAssert(originalAllow & rmask(rr));
NanoAssert(originalAllow & rmask(ra));
NanoAssert(originalAllow & rmask(rb));
}
void Assembler::asm_qbinop(LIns *ins) {
@ -1007,7 +1019,14 @@ namespace nanojit
Reservation *resv = getresv(value);
Register r;
if (!resv || (r = resv->reg) == UnknownReg) {
r = findRegFor(value, GpRegs & ~rmask(b));
RegisterMask allow;
LOpcode op = value->opcode();
if ((op >= LIR_fneg && op <= LIR_fmod) || op == LIR_fcall) {
allow = FpRegs;
} else {
allow = GpRegs;
}
r = findRegFor(value, allow & ~rmask(b));
}
if (IsGpReg(r)) {
@ -1123,6 +1142,7 @@ namespace nanojit
// rA already has a register assigned. caller must emit a copy
// to rr once instr code is generated. (ie mov rr,ra ; op rr)
}
NanoAssert(allow & rmask(rr));
}
static const AVMPLUS_ALIGN16(int64_t) negateMask[] = {0x8000000000000000LL,0};