diff options
| author | mrs <mrs@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-04-04 20:27:17 +0000 |
|---|---|---|
| committer | mrs <mrs@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-04-04 20:27:17 +0000 |
| commit | db20fb4785ee648ca9ff51a2530bf5d1e9d06427 (patch) | |
| tree | dbe6160ad6febabb7998df1b736a4d686b578623 /gcc/expmed.c | |
| parent | f450da21479a2fae2c1acab5409a603541fca144 (diff) | |
| download | gcc-db20fb4785ee648ca9ff51a2530bf5d1e9d06427.tar.gz | |
* doc/rtl.texi (const_double): Document as sign-extending.
* expmed.c (expand_mult): Ensure we don't use shift
incorrectly.
* emit-rtl.c (immed_double_int_const): Refine to state the
value is signed.
* simplify-rtx.c (mode_signbit_p): Add a fixme for wider than
CONST_DOUBLE integers.
(simplify_const_unary_operation, UNSIGNED_FLOAT): Ensure no
negative values are converted. Fix conversions bigger than
HOST_BITS_PER_WIDE_INT.
(simplify_binary_operation_1): Ensure we don't use shift
incorrectly.
(simplify_immed_subreg): Sign-extend CONST_DOUBLEs.
* explow.c (plus_constant_mode): Add.
(plus_constant): Implement with plus_constant_mode.
* rtl.h (plus_constant_mode): Add.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@186147 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 5eea2ab8b51..aa24fbf630b 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -3139,8 +3139,10 @@ expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target, { int shift = floor_log2 (CONST_DOUBLE_HIGH (op1)) + HOST_BITS_PER_WIDE_INT; - return expand_shift (LSHIFT_EXPR, mode, op0, - shift, target, unsignedp); + if (shift < 2 * HOST_BITS_PER_WIDE_INT - 1 + || GET_MODE_BITSIZE (mode) <= 2 * HOST_BITS_PER_WIDE_INT) + return expand_shift (LSHIFT_EXPR, mode, op0, + shift, target, unsignedp); } } |