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ARM: Drop hard-fp variants of floor/ceil/trunc.

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Soft-fp variants are faster on a Cortex-A9. Duh.
This commit is contained in:
Mike Pall
2012-10-15 16:53:03 +02:00
parent 894d2d6ef4
commit 2621617a92
3 changed files with 57 additions and 88 deletions
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24
src/lj_asm_arm.h
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@@ -1574,15 +1574,23 @@ static void asm_callid(ASMState *as, IRIns *ir, IRCallID id)
static void asm_callround(ASMState *as, IRIns *ir, int id)
{
/* The modified regs must match with the *.dasc implementation. */
RegSet drop = RID2RSET(RID_D0)|RID2RSET(RID_D1)|RID2RSET(RID_D2)|
RID2RSET(RID_R0)|RID2RSET(RID_R1);
if (ra_hasreg(ir->r)) rset_clear(drop, ir->r);
RegSet drop = RID2RSET(RID_R0)|RID2RSET(RID_R1)|RID2RSET(RID_R2)|
RID2RSET(RID_R3)|RID2RSET(RID_R12);
RegSet of;
Reg dest, src;
ra_evictset(as, drop);
ra_destreg(as, ir, RID_FPRET);
emit_call(as, id == IRFPM_FLOOR ? (void *)lj_vm_floor_hf :
id == IRFPM_CEIL ? (void *)lj_vm_ceil_hf :
(void *)lj_vm_trunc_hf);
ra_leftov(as, RID_D0, ir->op1);
dest = ra_dest(as, ir, RSET_FPR);
emit_dnm(as, ARMI_VMOV_D_RR, RID_RETLO, RID_RETHI, (dest & 15));
emit_call(as, id == IRFPM_FLOOR ? (void *)lj_vm_floor_sf :
id == IRFPM_CEIL ? (void *)lj_vm_ceil_sf :
(void *)lj_vm_trunc_sf);
/* Workaround to protect argument GPRs from being used for remat. */
of = as->freeset;
as->freeset &= ~RSET_RANGE(RID_R0, RID_R1+1);
as->cost[RID_R0] = as->cost[RID_R1] = REGCOST(~0u, ASMREF_L);
src = ra_alloc1(as, ir->op1, RSET_FPR); /* May alloc GPR to remat FPR. */
as->freeset |= (of & RSET_RANGE(RID_R0, RID_R1+1));
emit_dnm(as, ARMI_VMOV_RR_D, RID_R0, RID_R1, (src & 15));
}
#endif