From: Mike Stroyan Date: Thu, 13 Feb 2014 00:24:55 +0000 (-0700) Subject: i965: Avoid dependency hints on math opcodes X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=602510395a96a1f6ca29189e4f5cfb3f07f21d23;p=mesa.git i965: Avoid dependency hints on math opcodes Putting NoDDClr and NoDDChk dependency control on instruction sequences that include math opcodes can cause corruption of channels. Treat math opcodes like send opcodes and suppress dependency hinting. Signed-off-by: Mike Stroyan Tested-by: Tony Bertapelli Cc: mesa-stable@lists.freedesktop.org Reviewed-by: Matt Turner --- diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp index c34eec4d7dc..480a3097b42 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp @@ -849,6 +849,14 @@ vec4_visitor::opt_set_dependency_control() continue; } + /* Dependency control does not work well over math instructions. + */ + if (inst->is_math()) { + memset(last_grf_write, 0, sizeof(last_grf_write)); + memset(last_mrf_write, 0, sizeof(last_mrf_write)); + continue; + } + /* Now, see if we can do dependency control for this instruction * against a previous one writing to its destination. */