[Mesa-dev] [PATCH 1/6] i965: Only consider fixed_hw_reg in equals() if file is HW_REG/IMM.

[Matt Turner]

Noticed when debugging things that lead to the next patch.

On G45 (and presumably ILK) this helps register coalescing:

total instructions in shared programs: 4077373 -> 4077340 (-0.00%)
instructions in affected programs:     43751 -> 43718 (-0.08%)
helped:                                52
HURT:                                  2
---
 src/mesa/drivers/dri/i965/brw_fs.cpp   | 4 +++-
 src/mesa/drivers/dri/i965/brw_vec4.cpp | 5 +++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 81009a0..269914d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -427,7 +427,9 @@ fs_reg::equals(const fs_reg &r) const
            negate == r.negate &&
            abs == r.abs &&
            !reladdr && !r.reladdr &&
-           memcmp(&fixed_hw_reg, &r.fixed_hw_reg, sizeof(fixed_hw_reg)) == 0 &&
+           ((file != HW_REG && file != IMM) ||
+            memcmp(&fixed_hw_reg, &r.fixed_hw_reg,
+                   sizeof(fixed_hw_reg)) == 0) &&
            stride == r.stride);
 }
 
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index f18915a..b97b6c1 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -216,8 +216,9 @@ dst_reg::equals(const dst_reg &r) const
            writemask == r.writemask &&
            (reladdr == r.reladdr ||
             (reladdr && r.reladdr && reladdr->equals(*r.reladdr))) &&
-           memcmp(&fixed_hw_reg, &r.fixed_hw_reg,
-                  sizeof(fixed_hw_reg)) == 0);
+           ((file != HW_REG && file != IMM) ||
+            memcmp(&fixed_hw_reg, &r.fixed_hw_reg,
+                   sizeof(fixed_hw_reg)) == 0));
 }
 
 bool
-- 
2.4.6