Mesa (master): i965: Set MaxIfDepth to UINT_MAX on Gen6+ and 16 on prior generations.

Kenneth Graunke kwg at
Fri Oct 21 01:11:31 PDT 2011

Module: Mesa
Branch: master
Commit: 01f9fdc4acd28cc4630a3c71f2d007373f4d979c

Author: Kenneth Graunke <kenneth at>
Date:   Mon Sep 19 23:47:56 2011 -0700

i965: Set MaxIfDepth to UINT_MAX on Gen6+ and 16 on prior generations.

Commit 488fe51cf823ccd137c667f1e92dd86f8323b723 converted the EmitNoIfs
flag to MaxIfDepth, an unsigned integer saying "flatten if-statements
nested beyond this depth."

Unfortunately, i965 left this initialized to 0, which made ir_to_mesa
attempt to flatten all if-statements.  We didn't notice right away
because we usually throw away ir_to_mesa's code in favor of the native
VS and FS backends...but this still creates a lot of unnecessary work.

Signed-off-by: Kenneth Graunke <kenneth at>


 src/mesa/drivers/dri/i965/brw_context.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index c1b274f..95662dc 100644
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -116,6 +116,7 @@ brwCreateContext(int api,
    /* We want the GLSL compiler to emit code that uses condition codes */
    for (i = 0; i <= MESA_SHADER_FRAGMENT; i++) {
+      ctx->ShaderCompilerOptions[i].MaxIfDepth = intel->gen < 6 ? 16 : UINT_MAX;
       ctx->ShaderCompilerOptions[i].EmitCondCodes = true;
       ctx->ShaderCompilerOptions[i].EmitNVTempInitialization = true;
       ctx->ShaderCompilerOptions[i].EmitNoNoise = true;

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