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Improve uint64_t <-> FP conversions in x64 backend.

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This commit is contained in:
Mike Pall 2011-01-02 20:43:58 +01:00
parent 55a9be7809
commit e66b5b6eee
3 changed files with 21 additions and 16 deletions
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26
src/lj_asm.c
View File

@ -1641,18 +1641,15 @@ static void asm_conv(ASMState *as, IRIns *ir)
return;
#endif
} else { /* Integer to FP conversion. */
Reg tmp = (LJ_64 && st == IRT_U64) ? ra_scratch(as, RSET_GPR) : RID_NONE;
Reg left = (LJ_64 && (st == IRT_U32 || st == IRT_U64)) ?
ra_alloc1(as, lref, RSET_GPR) :
asm_fuseload(as, lref, RSET_GPR);
if (LJ_64 && st == IRT_U64) {
Reg tmpn = ra_scratch(as, rset_exclude(RSET_FPR, dest));
MCLabel l_end = emit_label(as);
emit_rr(as, XO_ADDSD, dest, tmpn);
emit_rr(as, XO_MOVD, tmpn|REX_64, tmp);
emit_loadu64(as, tmp, U64x(43f00000,00000000));
const void *k = lj_ir_k64_find(as->J, U64x(43f00000,00000000));
emit_rma(as, XO_ADDSD, dest, k); /* Add 2^64 to compensate. */
emit_sjcc(as, CC_NS, l_end);
emit_rr(as, XO_TEST, left|REX_64, left);
emit_rr(as, XO_TEST, left|REX_64, left); /* Check if u64 >= 2^63. */
}
emit_mrm(as, irt_isnum(ir->t) ? XO_CVTSI2SD : XO_CVTSI2SS,
dest|((LJ_64 && (st64 || st == IRT_U32)) ? REX_64 : 0), left);
@ -1675,15 +1672,22 @@ static void asm_conv(ASMState *as, IRIns *ir)
((ir->op2 & IRCONV_TRUNC) ? XO_CVTTSD2SI : XO_CVTSD2SI) :
((ir->op2 & IRCONV_TRUNC) ? XO_CVTTSS2SI : XO_CVTSS2SI);
if (LJ_64 && irt_isu64(ir->t)) {
Reg left = ra_alloc1(as, lref, RSET_FPR);
Reg tmpn = ra_scratch(as, rset_exclude(RSET_FPR, left));
const void *k = lj_ir_k64_find(as->J, U64x(c3f00000,00000000));
MCLabel l_end = emit_label(as);
Reg left = IR(lref)->r;
/* For inputs in [2^63,2^64-1] add -2^64 and convert again. */
if (ra_hasreg(left)) {
Reg tmpn = ra_scratch(as, rset_exclude(RSET_FPR, left));
emit_rr(as, op, dest|REX_64, tmpn);
emit_rr(as, XO_ADDSD, tmpn, left);
emit_rr(as, XO_MOVD, tmpn|REX_64, dest);
emit_loadu64(as, dest, U64x(c3f00000,00000000));
emit_rma(as, XMM_MOVRM(as), tmpn, k);
} else {
left = ra_allocref(as, lref, RSET_FPR);
emit_rr(as, op, dest|REX_64, left);
emit_rma(as, XO_ADDSD, left, k);
}
emit_sjcc(as, CC_NS, l_end);
emit_rr(as, XO_TEST, dest|REX_64, dest);
emit_rr(as, XO_TEST, dest|REX_64, dest); /* Check if dest < 2^63. */
emit_rr(as, op, dest|REX_64, left);
} else {
Reg left = asm_fuseload(as, lref, RSET_FPR);

6
src/lj_ir.c
View File

@ -195,7 +195,7 @@ void lj_ir_k64_freeall(jit_State *J)
}
/* Find 64 bit constant in chained array or add it. */
static cTValue *ir_k64_find(jit_State *J, uint64_t u64)
cTValue *lj_ir_k64_find(jit_State *J, uint64_t u64)
{
K64Array *k, *kp = NULL;
TValue *ntv;
@ -249,13 +249,13 @@ found:
/* Intern FP constant, given by its 64 bit pattern. */
TRef lj_ir_knum_u64(jit_State *J, uint64_t u64)
{
return lj_ir_k64(J, IR_KNUM, ir_k64_find(J, u64));
return lj_ir_k64(J, IR_KNUM, lj_ir_k64_find(J, u64));
}
/* Intern 64 bit integer constant. */
TRef lj_ir_kint64(jit_State *J, uint64_t u64)
{
return lj_ir_k64(J, IR_KINT64, ir_k64_find(J, u64));
return lj_ir_k64(J, IR_KINT64, lj_ir_k64_find(J, u64));
}
/* Check whether a number is int and return it. -0 is NOT considered an int. */

1
src/lj_iropt.h
View File

@ -41,6 +41,7 @@ static LJ_AINLINE IRRef lj_ir_nextins(jit_State *J)
LJ_FUNC TRef LJ_FASTCALL lj_ir_kint(jit_State *J, int32_t k);
LJ_FUNC void lj_ir_k64_freeall(jit_State *J);
LJ_FUNC TRef lj_ir_k64(jit_State *J, IROp op, cTValue *tv);
LJ_FUNC cTValue *lj_ir_k64_find(jit_State *J, uint64_t u64);
LJ_FUNC TRef lj_ir_knum_u64(jit_State *J, uint64_t u64);
LJ_FUNC TRef lj_ir_knumint(jit_State *J, lua_Number n);
LJ_FUNC TRef lj_ir_kint64(jit_State *J, uint64_t u64);