Mesa (master): gallivm: disable f16c when not using AVX

[Roland Scheidegger]

Module: Mesa
Branch: master
Commit: 711489648bcce5cd8fcf14e73e5affe069010c01
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=711489648bcce5cd8fcf14e73e5affe069010c01

Author: Roland Scheidegger <sroland at vmware.com>
Date:   Mon Oct 26 16:44:47 2015 +0100

gallivm: disable f16c when not using AVX

f16c intrinsic can only be emitted when AVX is used. So when we disable AVX
due to forcing 128bit vectors we must not use this intrinsic (depending on
llvm version, this worked previously because llvm used AVX even when we didn't
tell it to, however I've seen this fail with llvm 3.3 since
718249843b915decf8fccec92e466ac1a6219934 which seems to have the side effect
of disabling avx in llvm albeit it only touches sse flags really, but
with ea421e919ae6e72e1319fb205c42a6fb53ca2f82 it's now really disabled).
Albeit being able to use AVX with 128bit vectors also would have its uses, the
code as is really was meant to emulate jit code creation for less capable cpus.
v2: add some (ifdefed out) missing de-featuring options for simulating
less capable cpus.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle at amd.com>
Reviewed-by: Jose Fonseca <jfonseca at vmware.com>

---

 src/gallium/auxiliary/gallivm/lp_bld_init.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_init.c b/src/gallium/auxiliary/gallivm/lp_bld_init.c
index 017d075..96aba73 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_init.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_init.c
@@ -427,6 +427,7 @@ lp_build_init(void)
        */
       util_cpu_caps.has_avx = 0;
       util_cpu_caps.has_avx2 = 0;
+      util_cpu_caps.has_f16c = 0;
    }
 
 #ifdef PIPE_ARCH_PPC_64
@@ -458,7 +459,9 @@ lp_build_init(void)
    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