build/autoconf/gcc-pr49911.m4@6474c204b198 (annotated)
build/autoconf/gcc-pr49911.m4
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | dnl This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | dnl License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | dnl file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| michael@0 | 4 | |
| michael@0 | 5 | dnl Check if the compiler is gcc and has PR49911. If so |
| michael@0 | 6 | dnl disable vrp. |
| michael@0 | 7 | |
| michael@0 | 8 | AC_DEFUN([MOZ_GCC_PR49911], |
| michael@0 | 9 | [ |
| michael@0 | 10 | if test "$GNU_CC"; then |
| michael@0 | 11 | |
| michael@0 | 12 | AC_MSG_CHECKING(for gcc PR49911) |
| michael@0 | 13 | ac_have_gcc_pr49911="no" |
| michael@0 | 14 | AC_LANG_SAVE |
| michael@0 | 15 | AC_LANG_CPLUSPLUS |
| michael@0 | 16 | |
| michael@0 | 17 | _SAVE_CXXFLAGS=$CXXFLAGS |
| michael@0 | 18 | CXXFLAGS="-O2" |
| michael@0 | 19 | AC_TRY_RUN([ |
| michael@0 | 20 | extern "C" void abort(void); |
| michael@0 | 21 | typedef enum { |
| michael@0 | 22 | eax, ecx, edx, ebx, esp, ebp, |
| michael@0 | 23 | esi, edi } |
| michael@0 | 24 | RegisterID; |
| michael@0 | 25 | union StateRemat { |
| michael@0 | 26 | RegisterID reg_; |
| michael@0 | 27 | int offset_; |
| michael@0 | 28 | }; |
| michael@0 | 29 | static StateRemat FromRegister(RegisterID reg) { |
| michael@0 | 30 | StateRemat sr; |
| michael@0 | 31 | sr.reg_ = reg; |
| michael@0 | 32 | return sr; |
| michael@0 | 33 | } |
| michael@0 | 34 | static StateRemat FromAddress3(int address) { |
| michael@0 | 35 | StateRemat sr; |
| michael@0 | 36 | sr.offset_ = address; |
| michael@0 | 37 | if (address < 46 && address >= 0) { |
| michael@0 | 38 | abort(); |
| michael@0 | 39 | } |
| michael@0 | 40 | return sr; |
| michael@0 | 41 | } |
| michael@0 | 42 | struct FrameState { |
| michael@0 | 43 | StateRemat dataRematInfo2(bool y, int z) { |
| michael@0 | 44 | if (y) return FromRegister(RegisterID(1)); |
| michael@0 | 45 | return FromAddress3(z); |
| michael@0 | 46 | } |
| michael@0 | 47 | }; |
| michael@0 | 48 | FrameState frame; |
| michael@0 | 49 | StateRemat x; |
| michael@0 | 50 | __attribute__((noinline)) void jsop_setelem(bool y, int z) { |
| michael@0 | 51 | x = frame.dataRematInfo2(y, z); |
| michael@0 | 52 | } |
| michael@0 | 53 | int main(void) { |
| michael@0 | 54 | jsop_setelem(0, 47); |
| michael@0 | 55 | } |
| michael@0 | 56 | ], true, |
| michael@0 | 57 | ac_have_gcc_pr49911="yes", |
| michael@0 | 58 | true) |
| michael@0 | 59 | CXXFLAGS="$_SAVE_CXXFLAGS" |
| michael@0 | 60 | |
| michael@0 | 61 | AC_LANG_RESTORE |
| michael@0 | 62 | |
| michael@0 | 63 | if test "$ac_have_gcc_pr49911" = "yes"; then |
| michael@0 | 64 | AC_MSG_RESULT(yes) |
| michael@0 | 65 | CFLAGS="$CFLAGS -fno-tree-vrp" |
| michael@0 | 66 | CXXFLAGS="$CXXFLAGS -fno-tree-vrp" |
| michael@0 | 67 | else |
| michael@0 | 68 | AC_MSG_RESULT(no) |
| michael@0 | 69 | fi |
| michael@0 | 70 | fi |
| michael@0 | 71 | ]) |
