i965/fs: Use WE_all for gl_SampleID header register munging.
This code should execute without regard to the currently executing channels. Asking for gl_SampleID inside control flow might break in strange ways. It appears to break even at the top of the program in SIMD16 mode occasionally as well. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Matt Turner <mattst88@gmail.com> Reviewed-by: Chris Forbes <chrisf@ijw.co.nz> Cc: mesa-stable@lists.freedesktop.org
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@ -1305,12 +1305,16 @@ fs_visitor::emit_sampleid_setup(ir_variable *ir)
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* and then reading from it using vstride=1, width=4, hstride=0.
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* These computations hold good for 4x multisampling as well.
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*/
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emit(BRW_OPCODE_AND, t1,
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fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD)),
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fs_reg(0xc0));
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emit(BRW_OPCODE_SHR, t1, t1, fs_reg(5));
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fs_inst *inst;
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inst = emit(BRW_OPCODE_AND, t1,
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fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UD)),
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fs_reg(0xc0));
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inst->force_writemask_all = true;
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inst = emit(BRW_OPCODE_SHR, t1, t1, fs_reg(5));
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inst->force_writemask_all = true;
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/* This works for both SIMD8 and SIMD16 */
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emit(MOV(t2, brw_imm_v(0x3210)));
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inst = emit(MOV(t2, brw_imm_v(0x3210)));
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inst->force_writemask_all = true;
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/* This special instruction takes care of setting vstride=1,
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* width=4, hstride=0 of t2 during an ADD instruction.
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*/
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