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| author | Richard Stallman <rms@gnu.org> | 1993-11-16 07:20:33 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1993-11-16 07:20:33 +0000 |
| commit | aa988991ba0aec1677612c76ca5998460e77891f (patch) | |
| tree | 10e41fdd7294ac9e9f0f2a9815128fe3abea46a8 /gcc | |
| parent | 02b35b12a61e894e1fb1b6e98dbf9577049aa792 (diff) | |
| download | gcc-aa988991ba0aec1677612c76ca5998460e77891f.zip gcc-aa988991ba0aec1677612c76ca5998460e77891f.tar.gz gcc-aa988991ba0aec1677612c76ca5998460e77891f.tar.bz2 | |
(force_to_mode): Don't do right-shift in a narrower mode.
From-SVN: r6105
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/combine.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index aed4627..1d22a13 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -5608,6 +5608,11 @@ force_to_mode (x, mode, mask, reg) && (code_to_optab[(int) code]->handlers[(int) mode].insn_code != CODE_FOR_nothing)) ? mode : GET_MODE (x)); + /* It is not valid to do a right-shift in a narrower mode + than the one it came in with. */ + if ((code == LSHIFTRT || code == ASHIFTRT) + && GET_MODE_BITSIZE (mode) < GET_MODE_BITSIZE (GET_MODE (x))) + op_mode = GET_MODE (x); /* Truncate MASK to fit OP_MODE. */ if (op_mode) |