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Use SSE variants for IRFPM_FLOOR/CEIL/TRUNC unless SSE4.1 available.

master
Mike Pall 2009-12-22 05:40:49 +01:00
parent 298e3f5d54
commit 44a9d7b00c
2 changed files with 21 additions and 0 deletions
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18
src/lj_asm.c
View File

@ -2020,6 +2020,16 @@ static void asm_fpmath(ASMState *as, IRIns *ir)
as->mcp[0] = as->mcp[1]; as->mcp[1] = 0x0f; /* Swap 0F and REX. */
}
*--as->mcp = 0x66; /* 1st byte of ROUNDSD opcode. */
} else if (fpm <= IRFPM_TRUNC) {
/* The modified regs must match with the *.dasc implementation. */
RegSet drop = RSET_RANGE(RID_XMM0, RID_XMM3+1)|RID2RSET(RID_EAX);
if (ra_hasreg(ir->r))
rset_clear(drop, ir->r); /* Dest reg handled below. */
ra_evictset(as, drop);
ra_destreg(as, ir, RID_XMM0);
emit_call(as, fpm == IRFPM_FLOOR ? lj_vm_floor_sse :
fpm == IRFPM_CEIL ? lj_vm_ceil_sse : lj_vm_trunc_sse);
ra_left(as, RID_XMM0, ir->op1);
} else {
int32_t ofs = sps_scale(ir->s); /* Use spill slot or slots SPS_TEMP1/2. */
Reg dest = ir->r;
@ -3275,6 +3285,14 @@ static void asm_setup_regsp(ASMState *as, Trace *T)
if (inloop)
as->modset = RSET_SCRATCH;
break;
case IR_FPMATH:
if (ir->op2 <= IRFPM_TRUNC && !(as->flags & JIT_F_SSE4_1)) {
ir->prev = REGSP_HINT(RID_XMM0);
if (inloop)
as->modset |= RSET_RANGE(RID_XMM0, RID_XMM3+1)|RID2RSET(RID_EAX);
continue;
}
break;
/* Non-constant shift counts need to be in RID_ECX. */
case IR_BSHL: case IR_BSHR: case IR_BSAR: case IR_BROL: case IR_BROR:
if (!irref_isk(ir->op2) && !ra_hashint(IR(ir->op2)->r))

3
src/lj_vm.h
View File

@ -37,6 +37,9 @@ LJ_ASMF void lj_vm_exit_interp(void);
LJ_ASMF void lj_vm_floor(void);
LJ_ASMF void lj_vm_ceil(void);
LJ_ASMF void lj_vm_trunc(void);
LJ_ASMF void lj_vm_floor_sse(void);
LJ_ASMF void lj_vm_ceil_sse(void);
LJ_ASMF void lj_vm_trunc_sse(void);
LJ_ASMF void lj_vm_exp(void);
LJ_ASMF void lj_vm_exp2(void);
LJ_ASMF void lj_vm_pow(void);