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combine.c (force_to_mode): Set fuller_mask based only on mask, not op_mode.

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* combine.c (force_to_mode): Set fuller_mask based only on mask,
	not op_mode.

From-SVN: r71292
This commit is contained in:
Ian Lance Taylor 2003-09-11 04:44:23 +00:00 committed by Ian Lance Taylor
parent dbc66058f0
commit 50b29dbb90
2 changed files with 10 additions and 7 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2003-09-10 Ian Lance Taylor <ian@wasabisystems.com>
* combine.c (force_to_mode): Set fuller_mask based only on mask,
not op_mode.
Thu Sep 11 01:21:05 CEST 2003 Jan Hubicka <jh@suse.cz>
* c-objc-common.c (c_cannot_inline_tree_fn): Warn

12
gcc/combine.c
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@ -6833,15 +6833,13 @@ force_to_mode (rtx x, enum machine_mode mode, unsigned HOST_WIDE_INT mask,
mask &= GET_MODE_MASK (op_mode);
/* When we have an arithmetic operation, or a shift whose count we
do not know, we need to assume that all bit the up to the highest-order
do not know, we need to assume that all bits up to the highest-order
bit in MASK will be needed. This is how we form such a mask. */
if (op_mode)
fuller_mask = (GET_MODE_BITSIZE (op_mode) >= HOST_BITS_PER_WIDE_INT
? GET_MODE_MASK (op_mode)
: (((unsigned HOST_WIDE_INT) 1 << (floor_log2 (mask) + 1))
- 1));
if (mask & ((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)))
fuller_mask = ~(unsigned HOST_WIDE_INT) 0;
else
fuller_mask = ~(HOST_WIDE_INT) 0;
fuller_mask = (((unsigned HOST_WIDE_INT) 1 << (floor_log2 (mask) + 1))
- 1);
/* Determine what bits of X are guaranteed to be (non)zero. */
nonzero = nonzero_bits (x, mode);