From: Sébastien Villemot <sebastien@debian.org>
Date: Sun, 25 Oct 2020 14:04:33 +0000 (+0000)
Subject: Julia requires SSE2 on i386
X-Git-Tag: archive/raspbian/1.5.3+dfsg-1+rpi1~3^2^2~14
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=a2f6b6e9a45f48b9f013c6a10cb94b52728f7bfb;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 3427fdf..a097991 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -21,6 +21,9 @@
 #endif
 
 #include <setjmp.h>
+#ifdef __i386__
+#include <cpuid.h>
+#endif
 #include <string>
 #include <sstream>
 #include <fstream>
@@ -7418,6 +7421,14 @@ extern "C" void jl_init_llvm(void)
 #ifdef USE_POLLY
     polly::initializePollyPasses(Registry);
 #endif
+#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
 
     // Parse command line flags after initialization
     const char *const argv_tailmerge[] = {"", "-enable-tail-merge=0"}; // NOO TOUCHIE; NO TOUCH! See #922