From a09fc184acd0874ea9876cdb2c4b123b226d8587 Mon Sep 17 00:00:00 2001
From: Thiago Macieira <thiago.macieira@intel.com>
Date: Wed, 15 Nov 2017 21:01:15 -0800
Subject: Add a configure-time check for QT_COMPILER_SUPPORTS_SIMD_ALWAYS

This has two main benefits:
 1) introduces a qmake CONFIG we can use in .pro/.pri/.prf files
 2) removes the need to keep an up-to-date list of which compilers
    support the feature

The test is implemented as trying to compile every single SIMD test we
currently have, but without passing the -mXXX option. The reason for
trying all of them is that some people may have modified their mkspecs
to add -mXXX options or -march=XXX, which could enable the particular
feature we tried, resulting in a false positive outcome.

Change-Id: I938b024e38bf4aac9154fffd14f7784dc8d1f020
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
---
 configure.pri | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'configure.pri')

diff --git a/configure.pri b/configure.pri
index 83c0dee141..52147589bb 100644
--- a/configure.pri
+++ b/configure.pri
@@ -395,6 +395,19 @@ defineTest(qtConfTest_buildParts) {
     return(true)
 }
 
+defineTest(qtConfTest_x86SimdAlways) {
+    configs =
+    fpfx = $${currentConfig}.features
+    simd = sse2 sse3 ssse3 sse4_1 sse4_2 rdrnd aesni shani avx avx2 avx512f \
+        avx512er avx512cd avx512pf avx512dq avx512bw avx512vl avx512ifma avx512vbmi
+    for (f, simd) {
+        qtConfCheckFeature($$f)
+        equals($${fpfx}.$${f}.available, true): configs += $$f
+    }
+    $${1}.literal_args = $$system_quote(SIMD=$$join(configs, " "))
+    qtConfTest_compile($${1})
+}
+
 # custom outputs
 
 # this reloads the qmakespec as completely as reasonably possible.
-- 
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