Added armv7 fpu support

Author: rruuaanng

Python/pymath.c

@@ -17,3 +17,20 @@ void _Py_set_387controlword(unsigned short cw) {
     __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
 }
 #endif  // HAVE_GCC_ASM_FOR_X87
+
+#ifdef HAVE_GCC_ASM_FOR_ARMV7
+// Inline assembly for getting and setting the ARMv7-FPSCR control/status word on
+// GCC/arm.
+#ifdef _Py_MEMORY_SANITIZER
+__attribute__((no_sanitize_memory))
+#endif
+int32_t _Py_get_fpscr(void) {
+    int32_t fpscr;
+    __asm__ __volatile__ ("vmrs %0, fpscr" : "=m" (cw));
+    return fpscr;
+}
+
+void _Py_set_fpscr(int32_t cw) {
+    __asm__ __volatile__ ("vmsr fpscr, %0" : : "m" (cw));
+}
+#endif // HAVE_GCC_ASM_FOR_ARMV7

configure

@@ -5954,6 +5954,18 @@ AS_VAR_IF([ac_cv_gcc_asm_for_x87], [yes], [
     [Define if we can use gcc inline assembler to get and set x87 control word])
 ])
 
+AC_CACHE_CHECK([whether we can use gcc inline assembler to get and set armv7-fpscr control/status word], [ac_cv_gcc_asm_for_armv7], [
+AC_LINK_IFELSE(   [AC_LANG_PROGRAM([[]], [[
+  unsigned int cw;
+  __asm__ __volatile__ ("vmrs %0, fpscr" : "=m" (cw));
+  __asm__ __volatile__ ("vmsr fpscr, %0" : : "m" (cw));
+]])],[ac_cv_gcc_asm_for_armv7=yes],[ac_cv_gcc_asm_for_armv7=no])
+])
+AS_VAR_IF([ac_cv_gcc_asm_for_armv7], [yes], [
+    AC_DEFINE([HAVE_GCC_ASM_FOR_ARMV7], [1],
+    [Define if we can use gcc inline assembler to get and set fpscr control/status word])
+])
+
 AC_CACHE_CHECK([whether we can use gcc inline assembler to get and set mc68881 fpcr], [ac_cv_gcc_asm_for_mc68881], [
 AC_LINK_IFELSE(   [AC_LANG_PROGRAM([[]], [[
   unsigned int fpcr;

configure.ac

@@ -443,6 +443,10 @@
 /* Define to 1 if you have the `gai_strerror' function. */
 #undef HAVE_GAI_STRERROR
 
+/* Define if we can use gcc inline assembler to get and set fpscr
+   control/status word */
+#undef HAVE_GCC_ASM_FOR_ARMV7
+
 /* Define if we can use gcc inline assembler to get and set mc68881 fpcr */
 #undef HAVE_GCC_ASM_FOR_MC68881