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Re: extend fwprop optimization


On Thu, Mar 28, 2013 at 04:49:47PM +0100, Uros Bizjak wrote:
> 2013-03-27  Wei Mi  <wmi@google.com>
> 
> 	* config/i386/i386.md: Do shift truncation in define_insn
> 	instead of define_insn_and_split.
> 
> Please write ChangeLog as:
> 
> 	* config/i386/i386.md (*ashl<mode>3_mask): Rewrite as define_insn.
> 	Truncate operand 2 using %b asm operand modifier.
> 	(*<shift_insn><mode>3_mask): Ditto.
> 	(*<rotate_insn><mode>3_mask): Ditto.
> 
> OK for mainline and all release branches with these changes.

This broke bootstrap on x86_64-linux as well as i686-linux on the 4.6
branch.  Fixed thusly, committed as obvious after bootstrapping/regtesting
on those targets.

2013-04-03  Jakub Jelinek  <jakub@redhat.com>

	* config/i386/i386.md (*<shiftrt_insn><mode>3_mask): Use
	<shiftrt> instead of <shift>.

--- gcc/config/i386/i386.md.jj	2013-04-03 16:11:07.000000000 +0200
+++ gcc/config/i386/i386.md	2013-04-03 17:42:15.034672014 +0200
@@ -9827,7 +9827,7 @@ (define_insn "*<shiftrt_insn><mode>3_mas
    && (INTVAL (operands[3]) & (GET_MODE_BITSIZE (<MODE>mode)-1))
       == GET_MODE_BITSIZE (<MODE>mode)-1"
 {
-  return "<shift>{<imodesuffix>}\t{%b2, %0|%0, %b2}";
+  return "<shiftrt>{<imodesuffix>}\t{%b2, %0|%0, %b2}";
 }
   [(set_attr "type" "ishift")
    (set_attr "mode" "<MODE>")])


	Jakub


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