Typically BAD_FILE sources are used to mark a source as not present
what implies that no registers are read. This will become much more
frequent with logical send opcodes which have a large number of
sources, many of them optionally used and marked as BAD_FILE when they
aren't applicable. It will prove to be useful to be able to rely on
the value of regs_read() regardless of whether a source is present or
not.
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 09ff587..d031352 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -709,6 +709,7 @@ fs_inst::regs_read(int arg) const
switch (src[arg].file) {
case BAD_FILE:
+ return 0;
case UNIFORM:
case IMM:
return 1;
--
2.4.3
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