Mesa (master): gallivm: Add debug option to force SSE2.

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: 324451e73fae17c2844f24c7e02000bddc260e78
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=324451e73fae17c2844f24c7e02000bddc260e78

Author: Jose Fonseca <jfonseca at vmware.com>
Date:   Fri Apr  1 11:06:30 2016 +0100

gallivm: Add debug option to force SSE2.

For simulating less capable machines.

Reviewed-by: Roland Scheidegger <sroland at vmware.com>

---

 src/gallium/auxiliary/gallivm/lp_bld_init.c | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_init.c b/src/gallium/auxiliary/gallivm/lp_bld_init.c
index ab55be4..6e08ac4 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_init.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_init.c
@@ -399,6 +399,20 @@ lp_build_init(void)
 
    util_cpu_detect();
 
+   /* For simulating less capable machines */
+#ifdef DEBUG
+   if (debug_get_bool_option("LP_FORCE_SSE2", FALSE)) {
+      assert(util_cpu_caps.has_sse2);
+      util_cpu_caps.has_sse3 = 0;
+      util_cpu_caps.has_ssse3 = 0;
+      util_cpu_caps.has_sse4_1 = 0;
+      util_cpu_caps.has_sse4_2 = 0;
+      util_cpu_caps.has_avx = 0;
+      util_cpu_caps.has_avx2 = 0;
+      util_cpu_caps.has_f16c = 0;
+   }
+#endif
+
    /* AMD Bulldozer AVX's throughput is the same as SSE2; and because using
     * 8-wide vector needs more floating ops than 4-wide (due to padding), it is
     * actually more efficient to use 4-wide vectors on this processor.
@@ -456,17 +470,6 @@ lp_build_init(void)
 
    gallivm_initialized = TRUE;
 
-#if 0
-   /* For simulating less capable machines */
-   util_cpu_caps.has_sse3 = 0;
-   util_cpu_caps.has_ssse3 = 0;
-   util_cpu_caps.has_sse4_1 = 0;
-   util_cpu_caps.has_sse4_2 = 0;
-   util_cpu_caps.has_avx = 0;
-   util_cpu_caps.has_avx2 = 0;
-   util_cpu_caps.has_f16c = 0;
-#endif
-
    return TRUE;
 }