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| author | Richard Earnshaw <rearnsha@arm.com> | 2012-08-02 16:20:22 +0000 |
|---|---|---|
| committer | Richard Earnshaw <rearnsha@gcc.gnu.org> | 2012-08-02 16:20:22 +0000 |
| commit | ca26f665dd7204fa930dc7f6a936ac526cd66f74 (patch) | |
| tree | b69bf3d483cf99ad25f1bb911f848e36d4080b2d /gcc | |
| parent | 8812aab189d4519c0bb3f853867a2e12af0b6504 (diff) | |
| download | gcc-ca26f665dd7204fa930dc7f6a936ac526cd66f74.zip gcc-ca26f665dd7204fa930dc7f6a936ac526cd66f74.tar.gz gcc-ca26f665dd7204fa930dc7f6a936ac526cd66f74.tar.bz2 | |
arm.c (arm_gen_constant): Use UBFX for some AND operations when available.
* arm.c (arm_gen_constant): Use UBFX for some AND operations when
available.
From-SVN: r190088
Diffstat (limited to 'gcc')
| -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 973ae0d..578b0a0 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 701ab4c..00ccb92 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. */ |