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[PATCH][combine][1/2] Try to simplify before substituting

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* combine.c (combine_simplify_rtx): Move simplification step
	before various transformations/substitutions.

From-SVN: r225996
This commit is contained in:
Kyrylo Tkachov 2015-07-20 12:49:36 +00:00 committed by Kyrylo Tkachov
parent df2a7a38f6
commit 232c93296d
2 changed files with 50 additions and 45 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2015-07-20 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* combine.c (combine_simplify_rtx): Move simplification step
before various transformations/substitutions.
2015-07-20 Mikhail Maltsev <maltsevm@gmail.com>
* wide-int.h (struct binary_traits): Fix partial specialization syntax.

90
gcc/combine.c
View File

@ -5489,6 +5489,51 @@ combine_simplify_rtx (rtx x, machine_mode op0_mode, int in_dest,
SUBST (XEXP (x, 1), temp);
}
/* Try to fold this expression in case we have constants that weren't
present before. */
temp = 0;
switch (GET_RTX_CLASS (code))
{
case RTX_UNARY:
if (op0_mode == VOIDmode)
op0_mode = GET_MODE (XEXP (x, 0));
temp = simplify_unary_operation (code, mode, XEXP (x, 0), op0_mode);
break;
case RTX_COMPARE:
case RTX_COMM_COMPARE:
{
machine_mode cmp_mode = GET_MODE (XEXP (x, 0));
if (cmp_mode == VOIDmode)
{
cmp_mode = GET_MODE (XEXP (x, 1));
if (cmp_mode == VOIDmode)
cmp_mode = op0_mode;
}
temp = simplify_relational_operation (code, mode, cmp_mode,
XEXP (x, 0), XEXP (x, 1));
}
break;
case RTX_COMM_ARITH:
case RTX_BIN_ARITH:
temp = simplify_binary_operation (code, mode, XEXP (x, 0), XEXP (x, 1));
break;
case RTX_BITFIELD_OPS:
case RTX_TERNARY:
temp = simplify_ternary_operation (code, mode, op0_mode, XEXP (x, 0),
XEXP (x, 1), XEXP (x, 2));
break;
default:
break;
}
if (temp)
{
x = temp;
code = GET_CODE (temp);
op0_mode = VOIDmode;
mode = GET_MODE (temp);
}
/* If this is a simple operation applied to an IF_THEN_ELSE, try
applying it to the arms of the IF_THEN_ELSE. This often simplifies
things. Check for cases where both arms are testing the same
@ -5588,51 +5633,6 @@ combine_simplify_rtx (rtx x, machine_mode op0_mode, int in_dest,
}
}
/* Try to fold this expression in case we have constants that weren't
present before. */
temp = 0;
switch (GET_RTX_CLASS (code))
{
case RTX_UNARY:
if (op0_mode == VOIDmode)
op0_mode = GET_MODE (XEXP (x, 0));
temp = simplify_unary_operation (code, mode, XEXP (x, 0), op0_mode);
break;
case RTX_COMPARE:
case RTX_COMM_COMPARE:
{
machine_mode cmp_mode = GET_MODE (XEXP (x, 0));
if (cmp_mode == VOIDmode)
{
cmp_mode = GET_MODE (XEXP (x, 1));
if (cmp_mode == VOIDmode)
cmp_mode = op0_mode;
}
temp = simplify_relational_operation (code, mode, cmp_mode,
XEXP (x, 0), XEXP (x, 1));
}
break;
case RTX_COMM_ARITH:
case RTX_BIN_ARITH:
temp = simplify_binary_operation (code, mode, XEXP (x, 0), XEXP (x, 1));
break;
case RTX_BITFIELD_OPS:
case RTX_TERNARY:
temp = simplify_ternary_operation (code, mode, op0_mode, XEXP (x, 0),
XEXP (x, 1), XEXP (x, 2));
break;
default:
break;
}
if (temp)
{
x = temp;
code = GET_CODE (temp);
op0_mode = VOIDmode;
mode = GET_MODE (temp);
}
/* First see if we can apply the inverse distributive law. */
if (code == PLUS || code == MINUS
|| code == AND || code == IOR || code == XOR)