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| author | Roger Sayle <roger@eyesopen.com> | 2003-11-09 14:33:20 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2003-11-09 14:33:20 +0000 |
| commit | ce4191eed16e15397cc09bba95d8ef603ba05359 (patch) | |
| tree | c993edb42c75d10e8adc5feee8d68fa2f583bc7e /gcc/unroll.c | |
| parent | 8b93ca2dd22f8e6d2c3a5ab70d5d79c6ee6b665a (diff) | |
| download | gcc-ce4191eed16e15397cc09bba95d8ef603ba05359.zip gcc-ce4191eed16e15397cc09bba95d8ef603ba05359.tar.gz gcc-ce4191eed16e15397cc09bba95d8ef603ba05359.tar.bz2 | |
loop.c (check_dbra_loop): Try swapping the comparison operands of the loop condition to identify a...
* loop.c (check_dbra_loop): Try swapping the comparison operands
of the loop condition to identify a suitable induction variable.
* unroll.c (loop_iterations): Likewise.
From-SVN: r73391
Diffstat (limited to 'gcc/unroll.c')
| -rw-r--r-- | gcc/unroll.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/gcc/unroll.c b/gcc/unroll.c index 38659d4..cc415a7 100644 --- a/gcc/unroll.c +++ b/gcc/unroll.c @@ -3421,7 +3421,20 @@ loop_iterations (struct loop *loop) "Loop iterations: Iteration var not an integer.\n"); return 0; } - else if (REG_IV_TYPE (ivs, REGNO (iteration_var)) == BASIC_INDUCT) + + /* Try swapping the comparison to identify a suitable iv. */ + if (REG_IV_TYPE (ivs, REGNO (iteration_var)) != BASIC_INDUCT + && REG_IV_TYPE (ivs, REGNO (iteration_var)) != GENERAL_INDUCT + && GET_CODE (comparison_value) == REG + && REGNO (comparison_value) < ivs->n_regs) + { + rtx temp = comparison_value; + comparison_code = swap_condition (comparison_code); + comparison_value = iteration_var; + iteration_var = temp; + } + + if (REG_IV_TYPE (ivs, REGNO (iteration_var)) == BASIC_INDUCT) { if (REGNO (iteration_var) >= ivs->n_regs) abort (); |