diff options
| author | Richard Earnshaw <rearnsha@arm.com> | 2012-08-02 16:20:22 +0000 |
|---|---|---|
| committer | Richard Earnshaw <rearnsha@arm.com> | 2012-08-02 16:20:22 +0000 |
| commit | 9ef5116e85130bc56f1876c49f93706e2c2a8629 (patch) | |
| tree | b69bf3d483cf99ad25f1bb911f848e36d4080b2d | |
| parent | ab54bbe1f0c7674f4d1064df6349c7b5cfd356b5 (diff) | |
* arm.c (arm_gen_constant): Use UBFX for some AND operations when
available.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@190088 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/arm/arm.c | 25 |
2 files changed, 30 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 973ae0d3587..578b0a05485 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2012-08-02 Richard Earnshaw <rearnsha@arm.com> + + * arm.c (arm_gen_constant): Use UBFX for some AND operations when + available. + 2012-08-02 Richard Guenther <rguenther@suse.de> * tree-into-ssa.c (struct common_info_d): New struct. diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index 701ab4cfe2d..00ccb9280de 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -2982,6 +2982,31 @@ arm_gen_constant (enum rtx_code code, enum machine_mode mode, rtx cond, return 1; } + /* On targets with UXTH/UBFX, we can deal with AND (2^N)-1 in a single + insn. */ + if (code == AND && (i = exact_log2 (remainder + 1)) > 0 + && (arm_arch_thumb2 || (i == 16 && arm_arch6 && mode == SImode))) + { + if (generate) + { + if (mode == SImode && i == 16) + /* Use UXTH in preference to UBFX, since on Thumb2 it's a + smaller insn. */ + emit_constant_insn (cond, + gen_zero_extendhisi2 + (target, gen_lowpart (HImode, source))); + else + /* Extz only supports SImode, but we can coerce the operands + into that mode. */ + emit_constant_insn (cond, + gen_extzv_t2 (gen_lowpart (mode, target), + gen_lowpart (mode, source), + GEN_INT (i), const0_rtx)); + } + + return 1; + } + /* Calculate a few attributes that may be useful for specific optimizations. */ /* Count number of leading zeros. */ |