1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/build/autoconf/gcc-pr49911.m4 Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,71 @@
1.4 +dnl This Source Code Form is subject to the terms of the Mozilla Public
1.5 +dnl License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 +dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
1.7 +
1.8 +dnl Check if the compiler is gcc and has PR49911. If so
1.9 +dnl disable vrp.
1.10 +
1.11 +AC_DEFUN([MOZ_GCC_PR49911],
1.12 +[
1.13 +if test "$GNU_CC"; then
1.14 +
1.15 +AC_MSG_CHECKING(for gcc PR49911)
1.16 +ac_have_gcc_pr49911="no"
1.17 +AC_LANG_SAVE
1.18 +AC_LANG_CPLUSPLUS
1.19 +
1.20 +_SAVE_CXXFLAGS=$CXXFLAGS
1.21 +CXXFLAGS="-O2"
1.22 +AC_TRY_RUN([
1.23 +extern "C" void abort(void);
1.24 +typedef enum {
1.25 +eax, ecx, edx, ebx, esp, ebp,
1.26 +esi, edi }
1.27 +RegisterID;
1.28 +union StateRemat {
1.29 + RegisterID reg_;
1.30 + int offset_;
1.31 +};
1.32 +static StateRemat FromRegister(RegisterID reg) {
1.33 + StateRemat sr;
1.34 + sr.reg_ = reg;
1.35 + return sr;
1.36 +}
1.37 +static StateRemat FromAddress3(int address) {
1.38 + StateRemat sr;
1.39 + sr.offset_ = address;
1.40 + if (address < 46 && address >= 0) {
1.41 + abort();
1.42 + }
1.43 + return sr;
1.44 +}
1.45 +struct FrameState {
1.46 + StateRemat dataRematInfo2(bool y, int z) {
1.47 + if (y) return FromRegister(RegisterID(1));
1.48 + return FromAddress3(z);
1.49 + }
1.50 +};
1.51 +FrameState frame;
1.52 +StateRemat x;
1.53 +__attribute__((noinline)) void jsop_setelem(bool y, int z) {
1.54 + x = frame.dataRematInfo2(y, z);
1.55 +}
1.56 +int main(void) {
1.57 + jsop_setelem(0, 47);
1.58 +}
1.59 +], true,
1.60 + ac_have_gcc_pr49911="yes",
1.61 + true)
1.62 +CXXFLAGS="$_SAVE_CXXFLAGS"
1.63 +
1.64 +AC_LANG_RESTORE
1.65 +
1.66 +if test "$ac_have_gcc_pr49911" = "yes"; then
1.67 + AC_MSG_RESULT(yes)
1.68 + CFLAGS="$CFLAGS -fno-tree-vrp"
1.69 + CXXFLAGS="$CXXFLAGS -fno-tree-vrp"
1.70 +else
1.71 + AC_MSG_RESULT(no)
1.72 +fi
1.73 +fi
1.74 +])
