David Edelsohn - Re: [RS6000 PATCH] Implement bswapsi2 intrinsic (original) (raw)

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• From: David Edelsohn
• To: "Roger Sayle"
• Cc: gcc-patches at gcc dot gnu dot org, Andrew Pinski
• Date: Thu, 15 Feb 2007 14:15:11 -0500
• Subject: Re: [RS6000 PATCH] Implement bswapsi2 intrinsic
• References: <4048.68.35.10.103.1171037429.squirrel@mail.eyesopen.com>

As Andrew Pinski mentioned, I think a more complete patch is

something like the following. I tested that this produces the correct results for the testcases, but have not bootstrapped it yet.

David

David Edelsohn  <edelsohn@gnu.org>
Roger Sayle <roger@eyesopen.com>

* config/rs6000/rs6000.md (bswapsi2): New.

Index: rs6000.md

--- rs6000.md (revision 121912) +++ rs6000.md (working copy) @@ -2186,6 +2186,33 @@ DONE; })

+(define_insn "bswapsi2"

• [(set (match_operand:SI 0 "reg_or_mem_operand" "=r,Z,r")
• (bswap:SI (match_operand:SI 1 "reg_or_mem_operand" "Z,r,r")))]
• ""
• "@
• {lbrx|lwbrx} %0,%y1
• {stbrx|stwbrx} %1,%y0
• #"
• [(set_attr "length" "4,4,12")])
• +(define_split
• [(set (match_operand:SI 0 "gpc_reg_operand" "")
• (bswap:SI (match_operand:SI 1 "gpc_reg_operand" "")))]
• ""
• [(set (match_dup 0)
• (rotate:SI (match_dup 1) (const_int 8)))
• (set (zero_extract:SI (match_dup 0)

•       (const_int 8)

•       (const_int 0))

• (match_dup 1))
• (set (zero_extract:SI (match_dup 0)

•       (const_int 8)

•       (const_int 16))

• (rotate:SI (match_dup 1)

•      (const_int 16)))]

• "")
• (define_expand "mulsi3" [(use (match_operand:SI 0 "gpc_reg_operand" "")) (use (match_operand:SI 1 "gpc_reg_operand" ""))

• Follow-Ups:
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• References:
  • [RS6000 PATCH] Implement bswapsi2 intrinsic
    * From: Roger Sayle