Created attachment 36952 [details]
RADEON_DEBUG="fp" output

A small fragment shader produces the following output:
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r300: Unknown TGSI/RC opcode: CAL
r300: Unknown TGSI/RC opcode: BGNSUB
r300: Unknown TGSI/RC opcode: ENDSUB
r300 FP: Compiler Error:
r500_fragprog_emit.c::translate_rgb_op(): translate_rgb_op: unknown opcode ILLEGAL OPCODE

Using a dummy shader instead.
If there's an 'unknown opcode' message, please file a bug report and attach this log.
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The shader looks like this:
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vec3 floatToColor(float x)
{
	if(x == 1.0)
		return vec3(0, 0, 0);
}

void main()
{
	gl_FragColor.rgb = floatToColor(1);
}
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RADEON_DEBUG="fp" output is attached