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| author | Jan Hubicka <jh@suse.cz> | 2003-02-20 21:56:53 +0100 |
|---|---|---|
| committer | Jan Hubicka <hubicka@gcc.gnu.org> | 2003-02-20 20:56:53 +0000 |
| commit | b9422b69c4574ea53d1a5fdbc90de3935589e502 (patch) | |
| tree | 2415e41e359f1d67f528163fbed9de0eeb20bffe /gcc/combine.c | |
| parent | e182f0a397a1b985f86641787df37d12b1d00aa3 (diff) | |
| download | gcc-b9422b69c4574ea53d1a5fdbc90de3935589e502.zip gcc-b9422b69c4574ea53d1a5fdbc90de3935589e502.tar.gz gcc-b9422b69c4574ea53d1a5fdbc90de3935589e502.tar.bz2 | |
toplev.c (flag_sched2_use_superblocks, [...]): New global variables.
* toplev.c (flag_sched2_use_superblocks, flag_sched2_use_traces): New global variables.
(lang_independent_options): Add -fsched2-use-superblocks -fsced2-use-traces.
(rest_of_compilation): Deal with it.
* invoke.texi (-fsched2-use-traces, fsched2-use-superblocks): Declare.
* flags.h (flag_sched2_use_superblocks, flag_sched2_use_traces): Declare.
* rtl.h (reg_to_stack): Update prototype.
* reg-stack.c (reg_to_stack): Return when something has changed;
update liveness when executing after superblock scheduling.
* combine.c (simplify_shift_const): Simplify few special cases
into constants.
From-SVN: r63183
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index ce4d3aa..7792537 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -9431,6 +9431,16 @@ simplify_shift_const (x, code, result_mode, varop, orig_count) == 0)) code = LSHIFTRT; + if (code == LSHIFTRT + && GET_MODE_BITSIZE (shift_mode) <= HOST_BITS_PER_WIDE_INT + && !(nonzero_bits (varop, shift_mode) >> count)) + return const0_rtx; + if (code == ASHIFT + && GET_MODE_BITSIZE (shift_mode) <= HOST_BITS_PER_WIDE_INT + && !((nonzero_bits (varop, shift_mode) << count) + & GET_MODE_MASK (shift_mode))) + return const0_rtx; + switch (GET_CODE (varop)) { case SIGN_EXTEND: |