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authorMarek Olšák <>2014-10-28 19:49:44 +0100
committerEmil Velikov <>2014-10-29 18:18:36 +0000
commitd26258166ca056da62536bebdf107e21d9ce92fb (patch)
parente8c7affa66407932519fc6d82a449b453343d9fc (diff)
Revert "st/mesa: set MaxUnrollIterations = 255"
This reverts commit 20836c81851e0df29a8ee9c86e5e5388738c840b. 255 is a huge number. If you have a loop with 255 iterations, unrolling it will exceed the SM3 instruction limit. Let's use the default again. The comment about a SM3 limit doesn't make sense. For SM3, we generally want 32 (default) or a lower number due to the SM3 instruction limit, which is 512 instructions. For SM4, we can try higher numbers if needed, but some shaders can end up being pretty huge and shader compilation can take more time. This fixes a shader compile failure on R500/SM3. Reported on IRC. Cc: 10.2 10.3 <> Reviewed-by: Brian Paul <> (cherry picked from commit 6fcb5520b78cdf1e5013c125501932315a069955)
1 files changed, 1 insertions, 2 deletions
diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index 8fa21195db8..d9c9512a157 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -237,8 +237,7 @@ void st_init_limits(struct pipe_screen *screen,
if (options->EmitNoLoops)
options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
- else
- options->MaxUnrollIterations = 255; /* SM3 limit */
options->LowerClipDistance = true;