From: Sébastien Villemot <sebastien@debian.org>
Date: Tue, 31 Dec 2019 08:30:40 +0000 (+0000)
Subject: Julia requires SSE2 on i386
X-Git-Tag: archive/raspbian/1.4.1+dfsg-1+rpi1~2^2^2~16
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=b027bcfb44e356ea788455ffa4cebb7b5a4a5787;p=julia.git

Julia requires SSE2 on i386

Bug: https://github.com/JuliaLang/julia/issues/7185
Forwarded: no
Last-Update: 2015-11-01

This patch adds an explicit error message if the CPU does not support SSE2.
The CPU features are queried using the x86 CPUID opcode. The wrapper function
__get_cpuid() is provided by GCC and Clang. See <cpuid.h> for the list of
supported CPU extension flags.
Last-Update: 2015-11-01
Gbp-Pq: Name require-sse2-on-i386.patch
---

diff --git a/src/codegen.cpp b/src/codegen.cpp
index 1d6e98d..0c2989b 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -18,6 +18,9 @@
 #endif
 
 #include <setjmp.h>
+#ifdef __i386__
+#include <cpuid.h>
+#endif
 #include <string>
 #include <sstream>
 #include <fstream>
@@ -7631,6 +7634,15 @@ static void init_julia_llvm_env(Module *m)
 
 extern "C" void *jl_init_llvm(void)
 {
+#ifdef __i386__
+    unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0;
+    __get_cpuid(1, &eax, &ebx, &ecx, &edx);
+    if (!(edx & bit_SSE2)) {
+        fprintf(stderr, "Your processor does not have SSE2 extension, which is required by Julia. Exiting.\n");
+        exit(EXIT_FAILURE);
+    }
+#endif
+
     const char *const argv_tailmerge[] = {"", "-enable-tail-merge=0"}; // NOO TOUCHIE; NO TOUCH! See #922
     cl::ParseCommandLineOptions(sizeof(argv_tailmerge)/sizeof(argv_tailmerge[0]), argv_tailmerge, "disable-tail-merge\n");
 #if defined(_OS_WINDOWS_) && defined(_CPU_X86_64_)