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combine.c (simplify_shift_const): Move SHIFT_COUNT_TRUNCATED simplification above out of range check.

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* combine.c (simplify_shift_const): Move SHIFT_COUNT_TRUNCATED
        simplification above out of range check.

From-SVN: r47912
This commit is contained in:
Richard Henderson 2001-12-11 18:42:41 -08:00 committed by Richard Henderson
parent f3bfd09c28
commit 0051b6cae4
2 changed files with 21 additions and 17 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-12-11 Richard Henderson <rth@redhat.com>
* combine.c (simplify_shift_const): Move SHIFT_COUNT_TRUNCATED
simplification above out of range check.
2001-12-11 Dan Nicolaescu <dann@ics.uci.edu>
* config/sparc/sparc.md (prefetch): New.

33
gcc/combine.c
View File

@ -8811,15 +8811,14 @@ merge_outer_ops (pop0, pconst0, op1, const1, mode, pcomp_p)
are ASHIFTRT and ROTATE, which are always done in their original mode, */
static rtx
simplify_shift_const (x, code, result_mode, varop, input_count)
simplify_shift_const (x, code, result_mode, varop, orig_count)
rtx x;
enum rtx_code code;
enum machine_mode result_mode;
rtx varop;
int input_count;
int orig_count;
{
enum rtx_code orig_code = code;
int orig_count = input_count;
unsigned int count;
int signed_count;
enum machine_mode mode = result_mode;
@ -8833,27 +8832,27 @@ simplify_shift_const (x, code, result_mode, varop, input_count)
int complement_p = 0;
rtx new;
/* If we were given an invalid count, don't do anything except exactly
what was requested. */
if (input_count < 0 || input_count >= (int) GET_MODE_BITSIZE (mode))
{
if (x)
return x;
return gen_rtx_fmt_ee (code, mode, varop, GEN_INT (input_count));
}
count = input_count;
/* Make sure and truncate the "natural" shift on the way in. We don't
want to do this inside the loop as it makes it more difficult to
combine shifts. */
#ifdef SHIFT_COUNT_TRUNCATED
if (SHIFT_COUNT_TRUNCATED)
count %= GET_MODE_BITSIZE (mode);
orig_count &= GET_MODE_BITSIZE (mode) - 1;
#endif
/* If we were given an invalid count, don't do anything except exactly
what was requested. */
if (orig_count < 0 || orig_count >= (int) GET_MODE_BITSIZE (mode))
{
if (x)
return x;
return gen_rtx_fmt_ee (code, mode, varop, GEN_INT (orig_count));
}
count = orig_count;
/* Unless one of the branches of the `if' in this loop does a `continue',
we will `break' the loop after the `if'. */