The implementations of the ARB_shader_ballot intrinsics will explicitly
read the flag as a source register.
---
src/intel/compiler/brw_fs.cpp | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/src/intel/compiler/brw_fs.cpp b/src/intel/compiler/brw_fs.cpp
index 97908a4563..de3aafafb1 100644
--- a/src/intel/compiler/brw_fs.cpp
+++ b/src/intel/compiler/brw_fs.cpp
@@ -862,9 +862,6 @@ namespace {
unsigned
fs_inst::flags_read(const gen_device_info *devinfo) const
{
- /* XXX - This doesn't consider explicit uses of the flag register as source
- * region.
- */
if (predicate == BRW_PREDICATE_ALIGN1_ANYV ||
predicate == BRW_PREDICATE_ALIGN1_ALLV) {
/* The vertical predication modes combine corresponding bits from
@@ -875,7 +872,20 @@ fs_inst::flags_read(const gen_device_info *devinfo) const
} else if (predicate) {
return flag_mask(this);
} else {
- return 0;
+ unsigned mask = 0;
+ for (int i = 0; i < sources; i++) {
+ if (src[i].file == ARF) {
+ if (src[i].nr == BRW_ARF_FLAG + 0 && src[i].subnr == 0)
+ mask |= 0b0001;
+ if (src[i].nr == BRW_ARF_FLAG + 0 && src[i].subnr == 1)
+ mask |= 0b0010;
+ if (src[i].nr == BRW_ARF_FLAG + 1 && src[i].subnr == 0)
+ mask |= 0b0100;
+ if (src[i].nr == BRW_ARF_FLAG + 1 && src[i].subnr == 1)
+ mask |= 0b1000;
+ }
+ }
+ return mask;
}
}
--
2.13.0
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