| dnl This Source Code Form is subject to the terms of the Mozilla Public |
| dnl License, v. 2.0. If a copy of the MPL was not distributed with this |
| dnl file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| |
| dnl Check if the compiler is gcc and has PR49911. If so |
| dnl disable vrp. |
| |
| AC_DEFUN([MOZ_GCC_PR49911], |
| [ |
| if test "$GNU_CC"; then |
| |
| AC_MSG_CHECKING(for gcc PR49911) |
| ac_have_gcc_pr49911="no" |
| AC_LANG_SAVE |
| AC_LANG_CPLUSPLUS |
| |
| _SAVE_CXXFLAGS=$CXXFLAGS |
| CXXFLAGS="-O2" |
| AC_TRY_RUN([ |
| extern "C" void abort(void); |
| typedef enum { |
| eax, ecx, edx, ebx, esp, ebp, |
| esi, edi } |
| RegisterID; |
| union StateRemat { |
| RegisterID reg_; |
| int offset_; |
| }; |
| static StateRemat FromRegister(RegisterID reg) { |
| StateRemat sr; |
| sr.reg_ = reg; |
| return sr; |
| } |
| static StateRemat FromAddress3(int address) { |
| StateRemat sr; |
| sr.offset_ = address; |
| if (address < 46 && address >= 0) { |
| abort(); |
| } |
| return sr; |
| } |
| struct FrameState { |
| StateRemat dataRematInfo2(bool y, int z) { |
| if (y) return FromRegister(RegisterID(1)); |
| return FromAddress3(z); |
| } |
| }; |
| FrameState frame; |
| StateRemat x; |
| __attribute__((noinline)) void jsop_setelem(bool y, int z) { |
| x = frame.dataRematInfo2(y, z); |
| } |
| int main(void) { |
| jsop_setelem(0, 47); |
| } |
| ], true, |
| ac_have_gcc_pr49911="yes", |
| true) |
| CXXFLAGS="$_SAVE_CXXFLAGS" |
| |
| AC_LANG_RESTORE |
| |
| if test "$ac_have_gcc_pr49911" = "yes"; then |
| AC_MSG_RESULT(yes) |
| CFLAGS="$CFLAGS -fno-tree-vrp" |
| CXXFLAGS="$CXXFLAGS -fno-tree-vrp" |
| else |
| AC_MSG_RESULT(no) |
| fi |
| fi |
| ]) |
