prog_optimize: Set unused regs to PROGRAM_UNDEFINED after CMP->MOV conversion
Leaving the unused registers with other values caused assertion failures and other problems in places that blindly iterate over all sources. brw_vs_emit.c:1381: get_src_reg: Assertion `c->regs[file][index].nr != 0' failed. Fixes i965 piglit: vs-uniform-array-mat[234]-col-row-rd vs-uniform-array-mat[234]-index-col-row-rd vs-uniform-array-mat[234]-index-row-rd vs-uniform-mat[234]-col-row-rd Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Eric Anholt <eric@anholt.net>
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@ -1319,6 +1319,15 @@ _mesa_simplify_cmp(struct gl_program * program)
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inst->Opcode = OPCODE_MOV;
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inst->SrcReg[0] = inst->SrcReg[1];
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/* Unused operands are expected to have the file set to
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* PROGRAM_UNDEFINED. This is how _mesa_init_instructions initializes
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* all of the sources.
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*/
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inst->SrcReg[1].File = PROGRAM_UNDEFINED;
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inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
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inst->SrcReg[2].File = PROGRAM_UNDEFINED;
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inst->SrcReg[2].Swizzle = SWIZZLE_NOOP;
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}
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}
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if (dbg) {
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