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Add 8/16 to 32 bit sign/zero-extension variants to CONV.

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This commit is contained in:
Mike Pall 2010-12-31 22:49:23 +01:00
parent 007067bdd8
commit 3b47eba9cc
1 changed files with 24 additions and 1 deletions
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25
src/lj_asm.c
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@ -1676,7 +1676,30 @@ static void asm_conv(ASMState *as, IRIns *ir)
(irt_is64(ir->t) || irt_isu32(ir->t))) ? REX_64 : 0),
left);
}
} else { /* Integer to integer conversion. Only need 32/64 bit variants. */
} else if (st >= IRT_I8 && st <= IRT_U16) { /* Extend to 32 bit integer. */
Reg left, dest = ra_dest(as, ir, RSET_GPR);
RegSet allow = RSET_GPR;
x86Op op;
lua_assert(irt_isint(ir->t) || irt_isu32(ir->t));
if (st == IRT_I8) {
op = XO_MOVSXb; allow = RSET_GPR8; dest |= FORCE_REX;
} else if (st == IRT_U8) {
op = XO_MOVZXb; allow = RSET_GPR8; dest |= FORCE_REX;
} else if (st == IRT_I16) {
op = XO_MOVSXw;
} else {
op = XO_MOVZXw;
}
left = asm_fuseload(as, ir->op1, allow);
/* Add extra MOV if source is already in wrong register. */
if (!LJ_64 && left != RID_MRM && !rset_test(allow, left)) {
Reg tmp = ra_scratch(as, allow);
emit_rr(as, op, dest, tmp);
emit_rr(as, XO_MOV, tmp, left);
} else {
emit_mrm(as, op, dest, left);
}
} else { /* 32/64 bit integer conversions. */
if (irt_is64(ir->t)) {
#if LJ_32
/* NYI: conversion to 64 bit integers. */