7b7ec3f361
Test if the gcc we are using has PR49911 and if so disable value range propagation to avoid.
68 lines
1.3 KiB
Plaintext
68 lines
1.3 KiB
Plaintext
dnl Check if the compiler is gcc and has PR49911. If so
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dnl disable vrp.
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AC_DEFUN([MOZ_GCC_PR49911],
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[
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if test "$GNU_CC"; then
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AC_MSG_CHECKING(for gcc PR49911)
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ac_have_gcc_pr49911="no"
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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_SAVE_CXXFLAGS=$CXXFLAGS
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CXXFLAGS="-O2"
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AC_TRY_RUN([
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extern "C" void abort(void);
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typedef enum {
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eax, ecx, edx, ebx, esp, ebp,
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esi, edi }
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RegisterID;
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union StateRemat {
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RegisterID reg_;
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int offset_;
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};
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static StateRemat FromRegister(RegisterID reg) {
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StateRemat sr;
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sr.reg_ = reg;
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return sr;
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}
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static StateRemat FromAddress3(int address) {
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StateRemat sr;
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sr.offset_ = address;
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if (address < 46 && address >= 0) {
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abort();
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}
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return sr;
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}
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struct FrameState {
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StateRemat dataRematInfo2(bool y, int z) {
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if (y) return FromRegister(RegisterID(1));
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return FromAddress3(z);
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}
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};
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FrameState frame;
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StateRemat x;
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__attribute__((noinline)) void jsop_setelem(bool y, int z) {
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x = frame.dataRematInfo2(y, z);
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}
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int main(void) {
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jsop_setelem(0, 47);
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}
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], true,
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ac_have_gcc_pr49911="yes",
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true)
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CXXFLAGS="$_SAVE_CXXFLAGS"
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AC_LANG_RESTORE
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if test "$ac_have_gcc_pr49911" == "yes"; then
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AC_MSG_RESULT(yes)
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CFLAGS="$CFLAGS -fno-tree-vrp"
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CXXFLAGS="$CXXFLAGS -fno-tree-vrp"
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else
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AC_MSG_RESULT(no)
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fi
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fi
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])
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