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
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2012-08-02 Richard Earnshaw <rearnsha@arm.com>
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* arm.c (arm_gen_constant): Use UBFX for some AND operations when
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available.
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2012-08-02 Richard Guenther <rguenther@suse.de>
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* tree-into-ssa.c (struct common_info_d): New struct.
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@ -2982,6 +2982,31 @@ arm_gen_constant (enum rtx_code code, enum machine_mode mode, rtx cond,
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return 1;
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}
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/* On targets with UXTH/UBFX, we can deal with AND (2^N)-1 in a single
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insn. */
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if (code == AND && (i = exact_log2 (remainder + 1)) > 0
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&& (arm_arch_thumb2 || (i == 16 && arm_arch6 && mode == SImode)))
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{
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if (generate)
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{
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if (mode == SImode && i == 16)
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/* Use UXTH in preference to UBFX, since on Thumb2 it's a
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smaller insn. */
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emit_constant_insn (cond,
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gen_zero_extendhisi2
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(target, gen_lowpart (HImode, source)));
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else
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/* Extz only supports SImode, but we can coerce the operands
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into that mode. */
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emit_constant_insn (cond,
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gen_extzv_t2 (gen_lowpart (mode, target),
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gen_lowpart (mode, source),
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GEN_INT (i), const0_rtx));
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}
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return 1;
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}
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/* Calculate a few attributes that may be useful for specific
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optimizations. */
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/* Count number of leading zeros. */
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