Mesa (master): swr: Align swr_context allocation to SIMD alignment.

[Tim Rowley]

Module: Mesa
Branch: master
Commit: 97bbb7b6a3afadc22ef956f507f70998629fe99a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=97bbb7b6a3afadc22ef956f507f70998629fe99a

Author: Bruce Cherniak <bruce.cherniak at intel.com>
Date:   Wed Apr 12 18:43:25 2017 -0500

swr: Align swr_context allocation to SIMD alignment.

The context now contains SIMD vectors which must be aligned (specifically
samplePositions in the rastState in the derived state).  Failure to align
can result in segv crash on unaligned memory access in vector
instructions.

Reviewed-by: Tim Rowley <timothy.o.rowley at intel.com>

---

 src/gallium/drivers/swr/swr_context.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/swr/swr_context.cpp b/src/gallium/drivers/swr/swr_context.cpp
index 8c5a2692db..6f46d666ac 100644
--- a/src/gallium/drivers/swr/swr_context.cpp
+++ b/src/gallium/drivers/swr/swr_context.cpp
@@ -386,7 +386,7 @@ swr_destroy(struct pipe_context *pipe)
    if (screen->pipe == pipe)
       screen->pipe = NULL;
 
-   FREE(ctx);
+   AlignedFree(ctx);
 }
 
 
@@ -452,7 +452,10 @@ swr_UpdateStatsFE(HANDLE hPrivateContext, const SWR_STATS_FE *pStats)
 struct pipe_context *
 swr_create_context(struct pipe_screen *p_screen, void *priv, unsigned flags)
 {
-   struct swr_context *ctx = CALLOC_STRUCT(swr_context);
+   struct swr_context *ctx = (struct swr_context *)
+      AlignedMalloc(sizeof(struct swr_context), KNOB_SIMD_BYTES);
+   memset(ctx, 0, sizeof(struct swr_context));
+
    ctx->blendJIT =
       new std::unordered_map<BLEND_COMPILE_STATE, PFN_BLEND_JIT_FUNC>;