Signed-off-by: Elie Tournier <tournier.e...@gmail.com>
---
src/compiler/nir/nir_opt_loop_unroll.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/src/compiler/nir/nir_opt_loop_unroll.c
b/src/compiler/nir/nir_opt_loop_unroll.c
index 37cbced43d..035a030239 100644
--- a/src/compiler/nir/nir_opt_loop_unroll.c
+++ b/src/compiler/nir/nir_opt_loop_unroll.c
@@ -26,6 +26,14 @@
#include "nir_control_flow.h"
#include "nir_loop_analyze.h"
+
+/* This limit is chosen fairly arbitrarily. The GLSL IR limit is 25.
+ * However, due to slight differences in the way the two IRs count
+ * instructions, some loops that would unroll with GLSL IR fail to unroll
+ * if we set this to 25 so we set it to 26.
+ */
+#define LOOP_UNROLL_LIMIT 26
+
/* Prepare this loop for unrolling by first converting to lcssa and then
* converting the phis from the loops first block and the block that follows
* the loop into regs. Partially converting out of SSA allows us to unroll
@@ -460,7 +468,7 @@ is_loop_small_enough_to_unroll(nir_shader *shader,
nir_loop_info *li)
return true;
bool loop_not_too_large =
- li->num_instructions * li->trip_count <= max_iter * 26;
+ li->num_instructions * li->trip_count <= max_iter * LOOP_UNROLL_LIMIT;
return loop_not_too_large;
}
--
2.11.0
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