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tcg/optimize: Change fail return for do_constant_folding_cond*

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Return -1 instead of 2 for failure, so that we can
use comparisons against 0 for all cases.

Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-08-24 08:34:27 -07:00
parent ec5d4cbeef
commit 8d57bf1e82
1 changed files with 74 additions and 71 deletions
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145
tcg/optimize.c
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@ -502,10 +502,12 @@ static bool do_constant_folding_cond_eq(TCGCond c)
}
}
/* Return 2 if the condition can't be simplified, and the result
of the condition (0 or 1) if it can */
static TCGArg do_constant_folding_cond(TCGOpcode op, TCGArg x,
TCGArg y, TCGCond c)
/*
* Return -1 if the condition can't be simplified,
* and the result of the condition (0 or 1) if it can.
*/
static int do_constant_folding_cond(TCGOpcode op, TCGArg x,
TCGArg y, TCGCond c)
{
uint64_t xv = arg_info(x)->val;
uint64_t yv = arg_info(y)->val;
@ -527,15 +529,17 @@ static TCGArg do_constant_folding_cond(TCGOpcode op, TCGArg x,
case TCG_COND_GEU:
return 1;
default:
return 2;
return -1;
}
}
return 2;
return -1;
}
/* Return 2 if the condition can't be simplified, and the result
of the condition (0 or 1) if it can */
static TCGArg do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c)
/*
* Return -1 if the condition can't be simplified,
* and the result of the condition (0 or 1) if it can.
*/
static int do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c)
{
TCGArg al = p1[0], ah = p1[1];
TCGArg bl = p2[0], bh = p2[1];
@ -565,7 +569,7 @@ static TCGArg do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c)
if (args_are_copies(al, bl) && args_are_copies(ah, bh)) {
return do_constant_folding_cond_eq(c);
}
return 2;
return -1;
}
static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2)
@ -1321,22 +1325,21 @@ void tcg_optimize(TCGContext *s)
break;
CASE_OP_32_64(setcond):
tmp = do_constant_folding_cond(opc, op->args[1],
op->args[2], op->args[3]);
if (tmp != 2) {
tcg_opt_gen_movi(&ctx, op, op->args[0], tmp);
i = do_constant_folding_cond(opc, op->args[1],
op->args[2], op->args[3]);
if (i >= 0) {
tcg_opt_gen_movi(&ctx, op, op->args[0], i);
continue;
}
break;
CASE_OP_32_64(brcond):
tmp = do_constant_folding_cond(opc, op->args[0],
op->args[1], op->args[2]);
switch (tmp) {
case 0:
i = do_constant_folding_cond(opc, op->args[0],
op->args[1], op->args[2]);
if (i == 0) {
tcg_op_remove(s, op);
continue;
case 1:
} else if (i > 0) {
memset(&ctx.temps_used, 0, sizeof(ctx.temps_used));
op->opc = opc = INDEX_op_br;
op->args[0] = op->args[3];
@ -1345,10 +1348,10 @@ void tcg_optimize(TCGContext *s)
break;
CASE_OP_32_64(movcond):
tmp = do_constant_folding_cond(opc, op->args[1],
op->args[2], op->args[5]);
if (tmp != 2) {
tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[4-tmp]);
i = do_constant_folding_cond(opc, op->args[1],
op->args[2], op->args[5]);
if (i >= 0) {
tcg_opt_gen_mov(&ctx, op, op->args[0], op->args[4 - i]);
continue;
}
if (arg_is_const(op->args[3]) && arg_is_const(op->args[4])) {
@ -1412,14 +1415,14 @@ void tcg_optimize(TCGContext *s)
break;
case INDEX_op_brcond2_i32:
tmp = do_constant_folding_cond2(&op->args[0], &op->args[2],
op->args[4]);
if (tmp == 0) {
i = do_constant_folding_cond2(&op->args[0], &op->args[2],
op->args[4]);
if (i == 0) {
do_brcond_false:
tcg_op_remove(s, op);
continue;
}
if (tmp == 1) {
if (i > 0) {
do_brcond_true:
op->opc = opc = INDEX_op_br;
op->args[0] = op->args[5];
@ -1443,20 +1446,20 @@ void tcg_optimize(TCGContext *s)
if (op->args[4] == TCG_COND_EQ) {
/* Simplify EQ comparisons where one of the pairs
can be simplified. */
tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
op->args[0], op->args[2],
TCG_COND_EQ);
if (tmp == 0) {
i = do_constant_folding_cond(INDEX_op_brcond_i32,
op->args[0], op->args[2],
TCG_COND_EQ);
if (i == 0) {
goto do_brcond_false;
} else if (tmp == 1) {
} else if (i > 0) {
goto do_brcond_high;
}
tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
op->args[1], op->args[3],
TCG_COND_EQ);
if (tmp == 0) {
i = do_constant_folding_cond(INDEX_op_brcond_i32,
op->args[1], op->args[3],
TCG_COND_EQ);
if (i == 0) {
goto do_brcond_false;
} else if (tmp != 1) {
} else if (i < 0) {
break;
}
do_brcond_low:
@ -1470,31 +1473,31 @@ void tcg_optimize(TCGContext *s)
if (op->args[4] == TCG_COND_NE) {
/* Simplify NE comparisons where one of the pairs
can be simplified. */
tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
op->args[0], op->args[2],
TCG_COND_NE);
if (tmp == 0) {
i = do_constant_folding_cond(INDEX_op_brcond_i32,
op->args[0], op->args[2],
TCG_COND_NE);
if (i == 0) {
goto do_brcond_high;
} else if (tmp == 1) {
} else if (i > 0) {
goto do_brcond_true;
}
tmp = do_constant_folding_cond(INDEX_op_brcond_i32,
op->args[1], op->args[3],
TCG_COND_NE);
if (tmp == 0) {
i = do_constant_folding_cond(INDEX_op_brcond_i32,
op->args[1], op->args[3],
TCG_COND_NE);
if (i == 0) {
goto do_brcond_low;
} else if (tmp == 1) {
} else if (i > 0) {
goto do_brcond_true;
}
}
break;
case INDEX_op_setcond2_i32:
tmp = do_constant_folding_cond2(&op->args[1], &op->args[3],
op->args[5]);
if (tmp != 2) {
i = do_constant_folding_cond2(&op->args[1], &op->args[3],
op->args[5]);
if (i >= 0) {
do_setcond_const:
tcg_opt_gen_movi(&ctx, op, op->args[0], tmp);
tcg_opt_gen_movi(&ctx, op, op->args[0], i);
continue;
}
if ((op->args[5] == TCG_COND_LT || op->args[5] == TCG_COND_GE)
@ -1516,20 +1519,20 @@ void tcg_optimize(TCGContext *s)
if (op->args[5] == TCG_COND_EQ) {
/* Simplify EQ comparisons where one of the pairs
can be simplified. */
tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
op->args[1], op->args[3],
TCG_COND_EQ);
if (tmp == 0) {
i = do_constant_folding_cond(INDEX_op_setcond_i32,
op->args[1], op->args[3],
TCG_COND_EQ);
if (i == 0) {
goto do_setcond_const;
} else if (tmp == 1) {
} else if (i > 0) {
goto do_setcond_high;
}
tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
op->args[2], op->args[4],
TCG_COND_EQ);
if (tmp == 0) {
i = do_constant_folding_cond(INDEX_op_setcond_i32,
op->args[2], op->args[4],
TCG_COND_EQ);
if (i == 0) {
goto do_setcond_high;
} else if (tmp != 1) {
} else if (i < 0) {
break;
}
do_setcond_low:
@ -1543,20 +1546,20 @@ void tcg_optimize(TCGContext *s)
if (op->args[5] == TCG_COND_NE) {
/* Simplify NE comparisons where one of the pairs
can be simplified. */
tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
op->args[1], op->args[3],
TCG_COND_NE);
if (tmp == 0) {
i = do_constant_folding_cond(INDEX_op_setcond_i32,
op->args[1], op->args[3],
TCG_COND_NE);
if (i == 0) {
goto do_setcond_high;
} else if (tmp == 1) {
} else if (i > 0) {
goto do_setcond_const;
}
tmp = do_constant_folding_cond(INDEX_op_setcond_i32,
op->args[2], op->args[4],
TCG_COND_NE);
if (tmp == 0) {
i = do_constant_folding_cond(INDEX_op_setcond_i32,
op->args[2], op->args[4],
TCG_COND_NE);
if (i == 0) {
goto do_setcond_low;
} else if (tmp == 1) {
} else if (i > 0) {
goto do_setcond_const;
}
}