Problem with UBFE overwriting own operand

[MDeiml]

Sometimes when converting an UBFE opcode to GLSL code like this is generated:

u_xlatu0.x = bitfieldExtract(u_xlatu0.y, int(16), int(8));
u_xlatu0.y = bitfieldExtract(u_xlatu0.x, int(16), int(8));
u_xlatu0.z = bitfieldExtract(u_xlatu0.x, int(8), int(8));
u_xlatu0.w = bitfieldExtract(u_xlatu0.y, int(8), int(8));

This is wrong because u_xlatu0.y and u_xlatu0.z will always be zero.
I think this is caused by having to split the instruction into 4 calls to bitfieldExtract.

HLSLcc/src/toGLSLInstruction.cpp

Line 4010 in 45cd512

// Need to open this up, GLSL bitfieldextract uses same offset and width for all components