[Bug target/32201] New: [4.3 Regression] Can not allocate %xmm0 register for variable blend insn

["ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Currently, it is not possible to use SSE 4.1 variable blend instructions in asm
statements. These instructions require the third argument to be in %xmm0, but
gcc fails to allocate correct register even when (new) "z" constraint is used.

--cut here--
typedef float V4SFmode __attribute__((vector_size(16)));

V4SFmode t (V4SFmode a, V4SFmode b, V4SFmode c)
{
  V4SFmode ret;

  asm ("blenvdps %0, %2, %3" : "=x" (ret) : "0" (a), "x" (b), "z" (c));
  return ret;
}
--cut here--

gcc -O1 -msse

prxxx.c: In function 't':
prxxx.c:7: error: can't find a register in class 'SSE_FIRST_REG' while
reloading 'asm'
prxxx.c:7: error: 'asm' operand has impossible constraints


-- 
           Summary: [4.3 Regression] Can not allocate %xmm0 register for
                    variable blend insn
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: ssemmx, ra
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ubizjak at gmail dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
OtherBugsDependingO 32189
             nThis:


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32201