[Mesa-stable] [PATCH] swr: modifications to allow gcc-4.8 compilation

[Tim Rowley]

gcc-4.8 was missing the _mm*_undefined_* intrinsics and code
unconditionally used avx2 intrinsics in the avx compilation.
---
 src/gallium/drivers/swr/rasterizer/common/os.h           | 6 ++++++
 src/gallium/drivers/swr/rasterizer/common/simd16intrin.h | 4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/swr/rasterizer/common/os.h b/src/gallium/drivers/swr/rasterizer/common/os.h
index ef00a25..0b8f273 100644
--- a/src/gallium/drivers/swr/rasterizer/common/os.h
+++ b/src/gallium/drivers/swr/rasterizer/common/os.h
@@ -171,6 +171,12 @@ void _mm256_storeu2_m128i(__m128i *hi, __m128i *lo, __m256i a)
     _mm_storeu_si128((__m128i*)lo, _mm256_castsi256_si128(a));
     _mm_storeu_si128((__m128i*)hi, _mm256_extractf128_si256(a, 0x1));
 }
+
+// gcc prior to 4.9 doesn't have _mm*_undefined_*
+#if (__GNUC__) && (GCC_VERSION < 409000)
+#define _mm_undefined_si128 _mm_setzero_si128
+#define _mm256_undefined_ps _mm256_setzero_ps
+#endif
 #endif
 
 inline
diff --git a/src/gallium/drivers/swr/rasterizer/common/simd16intrin.h b/src/gallium/drivers/swr/rasterizer/common/simd16intrin.h
index aa47574..90c903d 100644
--- a/src/gallium/drivers/swr/rasterizer/common/simd16intrin.h
+++ b/src/gallium/drivers/swr/rasterizer/common/simd16intrin.h
@@ -405,8 +405,8 @@ INLINE simd16mask SIMDAPI _simd16_movemask_pd(simd16scalard a)
 
 INLINE uint64_t SIMDAPI _simd16_movemask_epi8(simd16scalari a)
 {
-    uint32_t mask_lo = _mm256_movemask_epi8(a.lo);
-    uint32_t mask_hi = _mm256_movemask_epi8(a.hi);
+    uint32_t mask_lo = _simd_movemask_epi8(a.lo);
+    uint32_t mask_hi = _simd_movemask_epi8(a.hi);
 
     return static_cast<uint64_t>(mask_lo) | (static_cast<uint64_t>(mask_hi) << 32);
 }
-- 
2.7.4