[Mesa-dev] [PATCH] r600g: don't reserve more stack space than required

[Vadim Girlin]

Overcautious stack reservation caused significant loss of performance.

Signed-off-by: Vadim Girlin <vadimgirlin at gmail.com>
---

No regressions with quick-driver.tests on evergreen.
Adds more than 30% FPS for Unigine Heaven with default backend.

 src/gallium/drivers/r600/r600_asm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/drivers/r600/r600_asm.c b/src/gallium/drivers/r600/r600_asm.c
index 3632aa5..6ee9bc0 100644
--- a/src/gallium/drivers/r600/r600_asm.c
+++ b/src/gallium/drivers/r600/r600_asm.c
@@ -1525,7 +1525,7 @@ int r600_bytecode_build(struct r600_bytecode *bc)
 	int i, r;
 
 	if (bc->callstack[0].max > 0)
-		bc->nstack = ((bc->callstack[0].max + 3) >> 2) + 2;
+		bc->nstack = ((bc->callstack[0].max + 3) >> 2);
 	if (bc->type == TGSI_PROCESSOR_VERTEX && !bc->nstack) {
 		bc->nstack = 1;
 	}
-- 
1.8.1.2