Hi,

the following fragment shader :

__
#version 130
uniform int mode;
uniform vec3 red;
uniform struct {
      vec3 green;
      vec3 blue;
} teststruct;
uniform vec3 testarray[3];
out vec3 fragColor;

void main()
{
   if (mode == 0)
      fragColor = red;
   if (mode == 1)
      fragColor = teststruct.green + teststruct.blue;
   if (mode == 2)
   {
      fragColor = vec3(0.);
      for(int i = 0; i < 3; i++)
         fragColor += testarray[i];
   }
}
__

is lowered to :
__
FRAG
PROPERTY FS_COLOR0_WRITES_ALL_CBUFS 1
DCL IN[0], COLOR, LINEAR
DCL OUT[0], COLOR
  0: MOV OUT[0], IN[0]
  1: END
__

using mesa from git, swrast, and setting glsl supported version to 130 in st_extensions.c ; glsl_compiler --dump-lir seems correct, so it might be an issue with glsl-to-tgsi.