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ifcvt.c (noce_try_store_flag_constants): Use trunc_int_for_mode when negating constants.

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* ifcvt.c (noce_try_store_flag_constants): Use trunc_int_for_mode
	when negating constants.

From-SVN: r44158
This commit is contained in:
Geoffrey Keating 2001-07-19 19:43:44 +00:00 committed by Geoffrey Keating
parent 7d46d51652
commit d54ef62c47
2 changed files with 14 additions and 7 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-07-19 Geoffrey Keating <geoffk@redhat.com>
* ifcvt.c (noce_try_store_flag_constants): Use trunc_int_for_mode
when negating constants.
2001-07-19 Toon Moene <toon@moene.indiv.nluug.nl>
* tree.def: Document restriction on {L|R}SHIFT_EXPR's second argument.

16
gcc/ifcvt.c
View File

@ -642,14 +642,16 @@ noce_try_store_flag_constants (if_info)
int reversep;
HOST_WIDE_INT itrue, ifalse, diff, tmp;
int normalize, can_reverse;
enum machine_mode mode;
if (! no_new_pseudos
&& GET_CODE (if_info->a) == CONST_INT
&& GET_CODE (if_info->b) == CONST_INT)
{
mode = GET_MODE (if_info->x);
ifalse = INTVAL (if_info->a);
itrue = INTVAL (if_info->b);
diff = itrue - ifalse;
diff = trunc_int_for_mode (mode, itrue - ifalse);
can_reverse = (reversed_comparison_code (if_info->cond, if_info->jump)
!= UNKNOWN);
@ -680,7 +682,7 @@ noce_try_store_flag_constants (if_info)
if (reversep)
{
tmp = itrue; itrue = ifalse; ifalse = tmp;
diff = -diff;
diff = trunc_int_for_mode (mode, -diff);
}
start_sequence ();
@ -695,7 +697,7 @@ noce_try_store_flag_constants (if_info)
=> x = 3 + (test == 0); */
if (diff == STORE_FLAG_VALUE || diff == -STORE_FLAG_VALUE)
{
target = expand_binop (GET_MODE (if_info->x),
target = expand_binop (mode,
(diff == STORE_FLAG_VALUE
? add_optab : sub_optab),
GEN_INT (ifalse), target, if_info->x, 0,
@ -706,7 +708,7 @@ noce_try_store_flag_constants (if_info)
=> x = (test != 0) << 3; */
else if (ifalse == 0 && (tmp = exact_log2 (itrue)) >= 0)
{
target = expand_binop (GET_MODE (if_info->x), ashl_optab,
target = expand_binop (mode, ashl_optab,
target, GEN_INT (tmp), if_info->x, 0,
OPTAB_WIDEN);
}
@ -715,7 +717,7 @@ noce_try_store_flag_constants (if_info)
=> x = -(test != 0) | b; */
else if (itrue == -1)
{
target = expand_binop (GET_MODE (if_info->x), ior_optab,
target = expand_binop (mode, ior_optab,
target, GEN_INT (ifalse), if_info->x, 0,
OPTAB_WIDEN);
}
@ -724,11 +726,11 @@ noce_try_store_flag_constants (if_info)
=> x = (-(test != 0) & (b - a)) + a; */
else
{
target = expand_binop (GET_MODE (if_info->x), and_optab,
target = expand_binop (mode, and_optab,
target, GEN_INT (diff), if_info->x, 0,
OPTAB_WIDEN);
if (target)
target = expand_binop (GET_MODE (if_info->x), add_optab,
target = expand_binop (mode, add_optab,
target, GEN_INT (ifalse), if_info->x, 0,
OPTAB_WIDEN);
}