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| author | David Edelsohn <edelsohn@gnu.org> | 2004-09-12 20:05:30 +0000 |
|---|---|---|
| committer | David Edelsohn <dje@gcc.gnu.org> | 2004-09-12 16:05:30 -0400 |
| commit | 3d520aaf7d3b6812a46efb99b20063b89d1bb524 (patch) | |
| tree | 64177dd93f46d8007e54530a6263757da7cd383b /gcc/expmed.c | |
| parent | c92d8761c7f6814e8ed7734aff920a40240ad43b (diff) | |
| download | gcc-3d520aaf7d3b6812a46efb99b20063b89d1bb524.tar.gz | |
re PR middle-end/16795 (PowerPC - Divide sequences by negative power of two could be more efficient)
PR target/16795
* expmed.c (expand_divmod): If cheap power of 2 divide is
available, use it for negative constant as well.
From-SVN: r87403
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index fe9aeb5c4c9..eb8226da75f 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -3764,7 +3764,19 @@ expand_divmod (int rem_flag, enum tree_code code, enum machine_mode mode, if (remainder) return gen_lowpart (mode, remainder); } - quotient = expand_sdiv_pow2 (compute_mode, op0, abs_d); + + if (sdiv_pow2_cheap[compute_mode] + && ((sdiv_optab->handlers[compute_mode].insn_code + != CODE_FOR_nothing) + || (sdivmod_optab->handlers[compute_mode].insn_code + != CODE_FOR_nothing))) + quotient = expand_divmod (0, TRUNC_DIV_EXPR, + compute_mode, op0, + gen_int_mode (abs_d, + compute_mode), + NULL_RTX, 0); + else + quotient = expand_sdiv_pow2 (compute_mode, op0, abs_d); /* We have computed OP0 / abs(OP1). If OP1 is negative, negate the quotient. */ |