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authorEric Anholt <eric@anholt.net>2010-10-10 12:13:35 -0700
committerEric Anholt <eric@anholt.net>2010-10-11 11:52:01 -0700
commit251fe2785484f7ba0c194c92fe0feff9c78b52ca (patch)
tree6dba04fa643ac3e5a3b195881ee11c8dbf205f29 /src/mesa
parent90c402204018c78f4a0b8a79515cf8c582092963 (diff)
i965: Reduce register interference checks for changed FS_OPCODE_DISCARD.
While I don't know of any performance changes from this (once extra reg available out of 128), it makes the generated asm a lot cleaner looking.
Diffstat (limited to 'src/mesa')
-rw-r--r--src/mesa/drivers/dri/i965/brw_fs.cpp7
1 files changed, 2 insertions, 5 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index f41e8783e6..798c36971f 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2706,10 +2706,7 @@ fs_visitor::dead_code_eliminate()
bool dead[num_vars];
for (int i = 0; i < num_vars; i++) {
- /* This would be ">=", but FS_OPCODE_DISCARD has a src == dst where
- * it writes dst then reads it as src.
- */
- dead[i] = this->virtual_grf_def[i] > this->virtual_grf_use[i];
+ dead[i] = this->virtual_grf_def[i] >= this->virtual_grf_use[i];
if (dead[i]) {
/* Mark off its interval so it won't interfere with anything. */
@@ -2824,7 +2821,7 @@ fs_visitor::virtual_grf_interferes(int a, int b)
this->virtual_grf_def[b] < this->virtual_grf_use[a]);
}
- return start <= end;
+ return start < end;
}
static struct brw_reg brw_reg_from_fs_reg(fs_reg *reg)