Mesa (master): util: try to use SSE instructions with MSVC and 32-bit gcc

[Brian Paul]

Module: Mesa
Branch: master
Commit: 5de29aeef00f6adf4b9ef278415d8f753283ef03
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=5de29aeef00f6adf4b9ef278415d8f753283ef03

Author: Brian Paul <brianp at vmware.com>
Date:   Wed Aug 17 10:41:30 2016 -0600

util: try to use SSE instructions with MSVC and 32-bit gcc

The lrint() and lrintf() functions are pretty slow and make some
texture transfers very inefficient.  This patch makes a better effort
at using those intrisics for 32-bit gcc and MSVC.

Note, this patch doesn't address the use of SSE4.1 with MSVC.

v2: get rid of the ROUND_WITH_SSE symbol, per Matt.

Reviewed-by: José Fonseca <jfonseca at vmware.com>
Reviewed-by: Matt Turner <mattst88 at gmail.com>

---

 src/util/rounding.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/util/rounding.h b/src/util/rounding.h
index afb38fb..dfc691e 100644
--- a/src/util/rounding.h
+++ b/src/util/rounding.h
@@ -29,7 +29,8 @@
 #include <limits.h>
 #include <stdint.h>
 
-#ifdef __x86_64__
+#if defined(__SSE__) || defined(_MSC_VER)
+/* MSVC always has SSE nowadays */
 #include <xmmintrin.h>
 #include <emmintrin.h>
 #endif
@@ -95,7 +96,7 @@ _mesa_roundeven(double x)
 static inline long
 _mesa_lroundevenf(float x)
 {
-#ifdef __x86_64__
+#if defined(__SSE__) || defined(_MSC_VER)
 #if LONG_MAX == INT64_MAX
    return _mm_cvtss_si64(_mm_load_ss(&x));
 #elif LONG_MAX == INT32_MAX
@@ -115,7 +116,7 @@ _mesa_lroundevenf(float x)
 static inline long
 _mesa_lroundeven(double x)
 {
-#ifdef __x86_64__
+#if defined(__SSE__) || defined(_MSC_VER)
 #if LONG_MAX == INT64_MAX
    return _mm_cvtsd_si64(_mm_load_sd(&x));
 #elif LONG_MAX == INT32_MAX