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tcg-mips: Simplify brcond 

Use the same table to fold comparisons as with setcond.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2014-04-15 22:20:57 -07:00
parent fd1cf66630
commit c068896f7f
1 changed files with 42 additions and 47 deletions
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89
tcg/mips/tcg-target.c
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@ -634,70 +634,65 @@ static void tcg_out_setcond(TCGContext *s, TCGCond cond, TCGReg ret,
} }
} }
static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGArg arg1, static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1,
TCGArg arg2, int label_index) TCGReg arg2, int label_index)
{ {
TCGLabel *l = &s->labels[label_index]; static const MIPSInsn b_zero[16] = {
[TCG_COND_LT] = OPC_BLTZ,
[TCG_COND_GT] = OPC_BGTZ,
[TCG_COND_LE] = OPC_BLEZ,
[TCG_COND_GE] = OPC_BGEZ,
};
TCGLabel *l;
MIPSInsn s_opc = OPC_SLTU;
MIPSInsn b_opc;
int cmp_map;
switch (cond) { switch (cond) {
case TCG_COND_EQ: case TCG_COND_EQ:
tcg_out_opc_br(s, OPC_BEQ, arg1, arg2); b_opc = OPC_BEQ;
break; break;
case TCG_COND_NE: case TCG_COND_NE:
tcg_out_opc_br(s, OPC_BNE, arg1, arg2); b_opc = OPC_BNE;
break; break;
case TCG_COND_LT: case TCG_COND_LT:
if (arg2 == 0) { case TCG_COND_GT:
tcg_out_opc_br(s, OPC_BLTZ, 0, arg1); case TCG_COND_LE:
} else {
tcg_out_opc_reg(s, OPC_SLT, TCG_TMP0, arg1, arg2);
tcg_out_opc_br(s, OPC_BNE, TCG_TMP0, TCG_REG_ZERO);
}
break;
case TCG_COND_LTU:
tcg_out_opc_reg(s, OPC_SLTU, TCG_TMP0, arg1, arg2);
tcg_out_opc_br(s, OPC_BNE, TCG_TMP0, TCG_REG_ZERO);
break;
case TCG_COND_GE: case TCG_COND_GE:
if (arg2 == 0) { if (arg2 == 0) {
tcg_out_opc_br(s, OPC_BGEZ, 0, arg1); b_opc = b_zero[cond];
} else { arg2 = arg1;
tcg_out_opc_reg(s, OPC_SLT, TCG_TMP0, arg1, arg2); arg1 = 0;
tcg_out_opc_br(s, OPC_BEQ, TCG_TMP0, TCG_REG_ZERO); break;
} }
break; s_opc = OPC_SLT;
case TCG_COND_GEU: /* FALLTHRU */
tcg_out_opc_reg(s, OPC_SLTU, TCG_TMP0, arg1, arg2);
tcg_out_opc_br(s, OPC_BEQ, TCG_TMP0, TCG_REG_ZERO); case TCG_COND_LTU:
break;
case TCG_COND_LE:
if (arg2 == 0) {
tcg_out_opc_br(s, OPC_BLEZ, 0, arg1);
} else {
tcg_out_opc_reg(s, OPC_SLT, TCG_TMP0, arg2, arg1);
tcg_out_opc_br(s, OPC_BEQ, TCG_TMP0, TCG_REG_ZERO);
}
break;
case TCG_COND_LEU:
tcg_out_opc_reg(s, OPC_SLTU, TCG_TMP0, arg2, arg1);
tcg_out_opc_br(s, OPC_BEQ, TCG_TMP0, TCG_REG_ZERO);
break;
case TCG_COND_GT:
if (arg2 == 0) {
tcg_out_opc_br(s, OPC_BGTZ, 0, arg1);
} else {
tcg_out_opc_reg(s, OPC_SLT, TCG_TMP0, arg2, arg1);
tcg_out_opc_br(s, OPC_BNE, TCG_TMP0, TCG_REG_ZERO);
}
break;
case TCG_COND_GTU: case TCG_COND_GTU:
tcg_out_opc_reg(s, OPC_SLTU, TCG_TMP0, arg2, arg1); case TCG_COND_LEU:
tcg_out_opc_br(s, OPC_BNE, TCG_TMP0, TCG_REG_ZERO); case TCG_COND_GEU:
cmp_map = mips_cmp_map[cond];
if (cmp_map & MIPS_CMP_SWAP) {
TCGReg t = arg1;
arg1 = arg2;
arg2 = t;
}
tcg_out_opc_reg(s, s_opc, TCG_TMP0, arg1, arg2);
b_opc = (cmp_map & MIPS_CMP_INV ? OPC_BEQ : OPC_BNE);
arg1 = TCG_TMP0;
arg2 = TCG_REG_ZERO;
break; break;
default: default:
tcg_abort(); tcg_abort();
break; break;
} }
tcg_out_opc_br(s, b_opc, arg1, arg2);
l = &s->labels[label_index];
if (l->has_value) { if (l->has_value) {
reloc_pc16(s->code_ptr - 1, l->u.value_ptr); reloc_pc16(s->code_ptr - 1, l->u.value_ptr);
} else { } else {