Mesa (master): i965: Mask out higher bits of the result of BRW_CMP producing a boolean.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 38d01c5b272d28a805e7598bad2f2ef5c8da732a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=38d01c5b272d28a805e7598bad2f2ef5c8da732a

Author: Eric Anholt <eric at anholt.net>
Date:   Fri Aug 27 13:49:09 2010 -0700

i965: Mask out higher bits of the result of BRW_CMP producing a boolean.

When it says it sets the LSB, that's not just a hint as to where the
result goes.  Only the LSB is modified.  Fixes 20 piglit cases.

---

 src/mesa/drivers/dri/i965/brw_fs.cpp |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 98d5d65..3f41a55 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -710,26 +710,32 @@ fs_visitor::visit(ir_expression *ir)
    case ir_binop_less:
       inst = emit(fs_inst(BRW_OPCODE_CMP, this->result, op[0], op[1]));
       inst->conditional_mod = BRW_CONDITIONAL_L;
+      emit(fs_inst(BRW_OPCODE_AND, this->result, this->result, fs_reg(0x1)));
       break;
    case ir_binop_greater:
       inst = emit(fs_inst(BRW_OPCODE_CMP, this->result, op[0], op[1]));
       inst->conditional_mod = BRW_CONDITIONAL_G;
+      emit(fs_inst(BRW_OPCODE_AND, this->result, this->result, fs_reg(0x1)));
       break;
    case ir_binop_lequal:
       inst = emit(fs_inst(BRW_OPCODE_CMP, this->result, op[0], op[1]));
       inst->conditional_mod = BRW_CONDITIONAL_LE;
+      emit(fs_inst(BRW_OPCODE_AND, this->result, this->result, fs_reg(0x1)));
       break;
    case ir_binop_gequal:
       inst = emit(fs_inst(BRW_OPCODE_CMP, this->result, op[0], op[1]));
       inst->conditional_mod = BRW_CONDITIONAL_GE;
+      emit(fs_inst(BRW_OPCODE_AND, this->result, this->result, fs_reg(0x1)));
       break;
    case ir_binop_equal:
       inst = emit(fs_inst(BRW_OPCODE_CMP, this->result, op[0], op[1]));
       inst->conditional_mod = BRW_CONDITIONAL_Z;
+      emit(fs_inst(BRW_OPCODE_AND, this->result, this->result, fs_reg(0x1)));
       break;
    case ir_binop_nequal:
       inst = emit(fs_inst(BRW_OPCODE_CMP, this->result, op[0], op[1]));
       inst->conditional_mod = BRW_CONDITIONAL_NZ;
+      emit(fs_inst(BRW_OPCODE_AND, this->result, this->result, fs_reg(0x1)));
       break;
 
    case ir_binop_logic_xor: