Add inttypes.h and some more math wrappers

Author: Mr-Wiseguy

include/libc/inttypes.h

@@ -0,0 +1,6 @@
+#ifndef LIBC_INTTYPES_H
+#define LIBC_INTTYPES_H
+
+#include "./stdint.h"
+
+#endif

src/math/math_wrappers.c

@@ -4,6 +4,14 @@ unsigned long long __ull_div(unsigned long long left, unsigned long long right);
 long long __ll_rem(long long left, unsigned long long right);
 long long __ll_div(long long left, long long right);
 long long __ll_mod(long long left, long long right);
+long long __d_to_ll(double d);
+long long __f_to_ll(float f);
+unsigned long long __d_to_ull(double d);
+unsigned long long __f_to_ull(float f);
+double __ll_to_d(long long s);
+float __ll_to_f(long long s);
+double __ull_to_d(unsigned long long u);
+float __ull_to_f(unsigned long long u);
 
 // Translations from libgcc math routines to ido ones.
 unsigned long long __umoddi3(unsigned long long a, unsigned long long b) {
@@ -21,3 +29,31 @@ long long __moddi3(long long a, long long b) {
 long long __divdi3 (long long a, long long b) {
     return __ll_div(a, b);
 }
+
+float __floatundisf(unsigned long long i) {
+    return __ull_to_f(i);
+}
+
+double __floatundidf(unsigned long long i) {
+    return __ull_to_d(i);
+}
+
+// clang doesn't allow inline asm for mips3 instructions in mips2 mode,
+// so use naked functions with raw bytes containing the instructions.
+__attribute__((naked)) double __floatdidf(long long i) {
+    __asm__ __volatile__(
+        "   .word 0x44850000\n" // mtc1    $a1, $fv0
+        "   .word 0x44840800\n" // mtc1    $a0, $fv0f
+        "   .word 0x03E00008\n" // jr      $ra
+        "   .word 0x46A00021\n" // cvt.d.l $fv0, $fv0
+    );
+}
+
+__attribute__((naked)) float __floatdisf(long long i) {
+    __asm__ __volatile__(
+        "   .word 0x44850000\n" // mtc1    $a1, $fv0
+        "   .word 0x44840800\n" // mtc1    $a0, $fv0f
+        "   .word 0x03E00008\n" // jr      $ra
+        "   .word 0x46A00020\n" // cvt.s.l $fv0, $fv0
+    );
+}