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| author | Bernd Schmidt <bernd.schmidt@codesourcery.com> | 2010-03-19 18:41:22 +0000 |
|---|---|---|
| committer | Bernd Schmidt <bernds@gcc.gnu.org> | 2010-03-19 18:41:22 +0000 |
| commit | c99102b8b4cc0ec725c741b13c6f406bbd924c73 (patch) | |
| tree | 2bcf096e2c7a2d0589b6d0f349bfdd7ccaef90f5 /gcc/optabs.c | |
| parent | 002b2dee5d23dff9cc0a7f3196838534bc084da4 (diff) | |
| download | gcc-c99102b8b4cc0ec725c741b13c6f406bbd924c73.zip gcc-c99102b8b4cc0ec725c741b13c6f406bbd924c73.tar.gz gcc-c99102b8b4cc0ec725c741b13c6f406bbd924c73.tar.bz2 | |
re PR target/40697 (inefficient code to extract least bits from an integer value)
gcc/
PR target/40697
* optabs.c (avoid_expensive_constant): Use rtx_cost to find out
the cost of loading the constant rather than assuming
COSTS_N_INSNS (1).
* config/arm/arm.c (thumb1_rtx_costs) <case CONST_INT>: If the
outer code is AND, do the same tests as the andsi3 expander and
return COSTS_N_INSNS (1) if and is cheap.
testsuite/
PR target/40697
* gcc.target/arm/thumb-andsi.c: New test.
From-SVN: r157582
Diffstat (limited to 'gcc/optabs.c')
| -rw-r--r-- | gcc/optabs.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c index 747166b..a82619e 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -1389,11 +1389,11 @@ static rtx avoid_expensive_constant (enum machine_mode mode, optab binoptab, rtx x, bool unsignedp) { + bool speed = optimize_insn_for_speed_p (); if (mode != VOIDmode && optimize && CONSTANT_P (x) - && rtx_cost (x, binoptab->code, optimize_insn_for_speed_p ()) - > COSTS_N_INSNS (1)) + && rtx_cost (x, binoptab->code, speed) > rtx_cost (x, SET, speed)) { if (CONST_INT_P (x)) { |