[libc] multiply and divide by 2 when INT_MIN

Signed-off-by: Shreeyash Pandey <[email protected]>

Author: bojle

libc/src/__support/fixed_point/fx_bits.h

@@ -22,8 +22,6 @@
 
 #include "fx_rep.h"
 
-#include <stdio.h>
-
 #ifdef LIBC_COMPILER_HAS_FIXED_POINT
 
 namespace LIBC_NAMESPACE_DECL {
@@ -255,7 +253,8 @@ template <typename XType> LIBC_INLINE constexpr XType divi(int n, int d) {
   uint64_t dv = static_cast<uint64_t>(d64 < 0 ? -d64 : d64);
 
   if (d == INT_MIN) {
-    dv = dv - 1; // Two's complement
+    nv <<= 1;
+    dv >>= 1;
   }
 
   uint32_t clz = cpp::countl_zero<uint32_t>(static_cast<uint32_t>(dv)) - 1;

libc/test/src/stdfix/DivITest.h

@@ -62,6 +62,8 @@ class DivITest : public LIBC_NAMESPACE::testing::Test {
 
     EXPECT_EQ(func(INT_MIN, 1), FRACT_MIN);
     EXPECT_LT(func(1, INT_MIN) - 0.r, epsilon);
+
+    EXPECT_EQ(func(INT_MIN, INT_MIN), 1.r);
   }
 };