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From: "savin.zlobec at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/59784] New: Nios2: Wrong code generation for fextsd custom instruction
Date: Mon, 13 Jan 2014 10:39:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59784

            Bug ID: 59784
           Summary: Nios2: Wrong code generation for fextsd custom
                    instruction
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: savin.zlobec at gmail dot com

Created attachment 31819
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31819&action=edit
Fix

The following code:

double f2d(float x) { return (double)x; }

Compiled with -O2 ... -mcustom-frdy=2 ... -mcustom-fextsd=37

Compiles to:

   0:     2009c972      custom     37,r4,r4,zero
   4:     0009c0b2      custom     2,r4,zero,zero
   8:     2005883a      mov     r2,r4
   c:     2807883a      mov     r3,r5
  10:     f800283a      ret

Note the 'custom 37,r4,r4,zero', should be 'custom 37,r5,r4,zero'.

Patch attached.