From a147b682697db1ce8e11010c72a19edb7eb7c213 Mon Sep 17 00:00:00 2001
From: Moonchild <mcwerewolf@gmail.com>
Date: Mon, 28 May 2018 05:42:07 +0000
Subject: Revert "Always build with SSE2 support & display an error if not
 available"

---
 browser/app/Makefile.in      |  8 --------
 browser/app/moz.build        |  4 ----
 browser/app/nsBrowserApp.cpp | 45 --------------------------------------------
 3 files changed, 57 deletions(-)

(limited to 'browser/app')

diff --git a/browser/app/Makefile.in b/browser/app/Makefile.in
index ca87f0995..d807b4337 100644
--- a/browser/app/Makefile.in
+++ b/browser/app/Makefile.in
@@ -23,14 +23,6 @@ NSDISTMODE = copy
 
 include $(topsrcdir)/config/config.mk
 
-# If we are trying to show an error dialog about the lack of SSE2 support,
-# make sure that code itself doesn't use SSE2.
-ifdef MOZ_LINUX_SSE2_STARTUP_ERROR
-CXXFLAGS := $(filter-out -march=% -msse2 -mfpmath=sse,$(CXXFLAGS))
-CXX := $(filter-out -march=% -msse2 -mfpmath=sse,$(CXX))
-CXXFLAGS += -msse -mno-sse2 -mfpmath=387
-endif
-
 ifeq ($(OS_ARCH),WINNT)
 # Rebuild firefox.exe if the manifest changes - it's included by splash.rc.
 # (this dependency should really be just for firefox.exe, not other targets)
diff --git a/browser/app/moz.build b/browser/app/moz.build
index 9650761ee..1004e280c 100644
--- a/browser/app/moz.build
+++ b/browser/app/moz.build
@@ -70,10 +70,6 @@ if CONFIG['HAVE_CLOCK_MONOTONIC']:
 if CONFIG['MOZ_GPSD']:
     DEFINES['MOZ_GPSD'] = True
 
-
-if CONFIG['MOZ_LINUX_SSE2_STARTUP_ERROR']:
-    DEFINES['MOZ_LINUX_SSE2_STARTUP_ERROR'] = True
-
 for icon in ('firefox', 'document', 'newwindow', 'newtab', 'pbmode'):
     DEFINES[icon.upper() + '_ICO'] = '"%s/dist/branding/%s.ico"' % (
         TOPOBJDIR, icon)
diff --git a/browser/app/nsBrowserApp.cpp b/browser/app/nsBrowserApp.cpp
index fc5ea8785..66ea8aed5 100644
--- a/browser/app/nsBrowserApp.cpp
+++ b/browser/app/nsBrowserApp.cpp
@@ -35,51 +35,6 @@
 #include "mozilla/Telemetry.h"
 #include "mozilla/WindowsDllBlocklist.h"
 
-#ifdef MOZ_LINUX_SSE2_STARTUP_ERROR
-#include <cpuid.h>
-#include "mozilla/Unused.h"
-
-static bool
-IsSSE2Available()
-{
-  // The rest of the app has been compiled to assume that SSE2 is present
-  // unconditionally, so we can't use the normal copy of SSE.cpp here.
-  // Since SSE.cpp caches the results and we need them only transiently,
-  // instead of #including SSE.cpp here, let's just inline the specific check
-  // that's needed.
-  unsigned int level = 1u;
-  unsigned int eax, ebx, ecx, edx;
-  unsigned int bits = (1u<<26);
-  unsigned int max = __get_cpuid_max(0, nullptr);
-  if (level > max) {
-    return false;
-  }
-  __cpuid_count(level, 0, eax, ebx, ecx, edx);
-  return (edx & bits) == bits;
-}
-
-static const char sSSE2Message[] =
-    "This browser version requires a processor with the SSE2 instruction "
-    "set extension.\n";
-
-__attribute__((constructor))
-static void
-SSE2Check()
-{
-  if (IsSSE2Available()) {
-    return;
-  }
-  // Using write() in order to avoid jemalloc-based buffering. Ignoring return
-  // values, since there isn't much we could do on failure and there is no
-  // point in trying to recover from errors.
-  MOZ_UNUSED(write(STDERR_FILENO,
-                   sSSE2Message,
-                   MOZ_ARRAY_LENGTH(sSSE2Message) - 1));
-  // _exit() instead of exit() to avoid running the usual "at exit" code.
-  _exit(255);
-}
-#endif
-
 #if !defined(MOZ_WIDGET_COCOA) && !defined(MOZ_WIDGET_ANDROID)
 #define MOZ_BROWSER_CAN_BE_CONTENTPROC
 #include "../../ipc/contentproc/plugin-container.cpp"
-- 
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