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revert: simplify-rtx.c (simplify_const_binary_operation): Use the shift_truncation_mask hook instead of performing modulo by width.

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Revert:
	* simplify-rtx.c (simplify_const_binary_operation): Use the
	shift_truncation_mask hook instead of performing modulo by
	width.  Compare against mode precision, not bitsize.
	* combine.c (combine_simplify_rtx, simplify_shift_const_1):
	Use shift_truncation_mask instead of constructing the value
	manually.

From-SVN: r175949
This commit is contained in:
Bernd Schmidt 2011-07-06 23:56:28 +00:00 • committed by Bernd Schmidt
parent 5511bc5ada
commit d58c1a38e5
3 changed files with 14 additions and 4 deletions
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8
gcc/ChangeLog
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@ -44,6 +44,14 @@
simplify_comparison, record_promoted_value, simplify_compare_const,
record_dead_and_set_regs_1): Likewise.
Revert:
* simplify-rtx.c (simplify_const_binary_operation): Use the
shift_truncation_mask hook instead of performing modulo by
width. Compare against mode precision, not bitsize.
* combine.c (combine_simplify_rtx, simplify_shift_const_1):
Use shift_truncation_mask instead of constructing the value
manually.
2011-07-06 Michael Meissner <meissner@linux.vnet.ibm.com>
* config/rs6000/rs6000-protos.h (rs6000_call_indirect_aix): New

6
gcc/combine.c
View file

@ -5939,7 +5939,9 @@ combine_simplify_rtx (rtx x, enum machine_mode op0_mode, int in_dest,
else if (SHIFT_COUNT_TRUNCATED && !REG_P (XEXP (x, 1)))
SUBST (XEXP (x, 1),
force_to_mode (XEXP (x, 1), GET_MODE (XEXP (x, 1)),
targetm.shift_truncation_mask (GET_MODE (x)),
((unsigned HOST_WIDE_INT) 1
<< exact_log2 (GET_MODE_BITSIZE (GET_MODE (x))))
- 1,
0));
break;
@ -9875,7 +9877,7 @@ simplify_shift_const_1 (enum rtx_code code, enum machine_mode result_mode,
want to do this inside the loop as it makes it more difficult to
combine shifts. */
if (SHIFT_COUNT_TRUNCATED)
orig_count &= targetm.shift_truncation_mask (mode);
orig_count &= GET_MODE_BITSIZE (mode) - 1;
/* If we were given an invalid count, don't do anything except exactly
what was requested. */

4
gcc/simplify-rtx.c
View file

@ -3768,8 +3768,8 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
shift_truncation_mask, since the shift might not be part of an
ashlM3, lshrM3 or ashrM3 instruction. */
if (SHIFT_COUNT_TRUNCATED)
arg1 &= targetm.shift_truncation_mask (mode);
else if (arg1 < 0 || arg1 >= GET_MODE_PRECISION (mode))
arg1 = (unsigned HOST_WIDE_INT) arg1 % width;
else if (arg1 < 0 || arg1 >= GET_MODE_BITSIZE (mode))
return 0;
val = (code == ASHIFT