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Re: PATCH RFA: Use clz for MIPS ffs

From: Richard Henderson <rth at redhat dot com>
To: Ian Lance Taylor <ian at airs dot com>
Cc: gcc-patches at gcc dot gnu dot org, richard at codesourcery dot com, echristo at redhat dot com, Paul Koning <pkoning at equallogic dot com>
Date: Tue, 12 Jul 2005 21:32:06 -0700
Subject: Re: PATCH RFA: Use clz for MIPS ffs
References: <m3ll4ht1sc.fsf@gossamer.airs.com> <87vf3k33g6.fsf@talisman.home> <m3ackwrokb.fsf@gossamer.airs.com> <87oe9bhi5v.fsf@talisman.home> <17106.26037.694510.177595@gargle.gargle.HOWL> <m3hdeziiwp.fsf_-_@gossamer.airs.com>

On Tue, Jul 12, 2005 at 06:39:18PM -0700, Ian Lance Taylor wrote:
> +  emit_insn (gen_clz<mode>2 (r3, r2));
> +  emit_move_insn (r4, GEN_INT (GET_MODE_BITSIZE (<MODE>mode)));
> +  emit_insn (gen_sub<mode>3 (operands[0], r4, r3));

The mips port needs to define CLZ_DEFINED_VALUE_AT_ZERO before
you won't get into trouble with this.


r~

Follow-Ups:
- Re: PATCH RFA: Use clz for MIPS ffs
  - From: Ian Lance Taylor

References:
- PATCH RFA: Change MIPS ffs<mode>2 from define_insn to define_expand
  - From: Ian Lance Taylor
- Re: PATCH RFA: Change MIPS ffs<mode>2 from define_insn to define_expand
  - From: Richard Sandiford
- Re: PATCH RFA: Change MIPS ffs<mode>2 from define_insn to define_expand
  - From: Ian Lance Taylor
- Re: PATCH RFA: Change MIPS ffs<mode>2 from define_insn to define_expand
  - From: Richard Sandiford
- Re: PATCH RFA: Change MIPS ffs<mode>2 from define_insn to define_expand
  - From: Paul Koning
- PATCH RFA: Use clz for MIPS ffs
  - From: Ian Lance Taylor

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