Fix computation of INTX_MIN

The minimum is -2^(bitwidth-1), not -2^bitwidth.  Oops.

1 files changed, 4 insertions, 4 deletions

diff --git a/p256_64.c b/p256_64.c
index 70b523744..2bd9b8d51 100644
--- a/p256_64.c
+++ b/p256_64.c
@@ -46,7 +46,7 @@ static void fiat_p256_addcarryx_u64(uint64_t* out1, fiat_p256_uint1* out2, fiat_
  */
 static void fiat_p256_subborrowx_u64(uint64_t* out1, fiat_p256_uint1* out2, fiat_p256_uint1 arg1, uint64_t arg2, uint64_t arg3) {
   fiat_p256_int128 x1 = ((arg2 - (fiat_p256_int128)arg1) - arg3);
-  fiat_p256_int1 x2 = (fiat_p256_int1)((fiat_p256_int256)x1 >> 64);
+  fiat_p256_int1 x2 = (fiat_p256_int1)(x1 >> 64);
   uint64_t x3 = (uint64_t)(x1 & UINT64_C(0xffffffffffffffff));
   *out1 = x3;
   *out2 = (fiat_p256_uint1)(0x0 - x2);
@@ -1183,7 +1183,7 @@ static void fiat_p256_to_bytes(uint8_t out1[32], const uint64_t arg1[4]) {
   uint8_t x16 = (uint8_t)(x13 & UINT8_C(0xff));
   uint8_t x17 = (uint8_t)(x15 >> 8);
   uint8_t x18 = (uint8_t)(x15 & UINT8_C(0xff));
-  fiat_p256_uint1 x19 = (fiat_p256_uint1)((int64_t)x17 >> 8);
+  fiat_p256_uint1 x19 = (fiat_p256_uint1)(x17 >> 8);
   uint8_t x20 = (uint8_t)(x17 & UINT8_C(0xff));
   uint64_t x21 = (x19 + x3);
   uint64_t x22 = (x21 >> 8);
@@ -1200,7 +1200,7 @@ static void fiat_p256_to_bytes(uint8_t out1[32], const uint64_t arg1[4]) {
   uint8_t x33 = (uint8_t)(x30 & UINT8_C(0xff));
   uint8_t x34 = (uint8_t)(x32 >> 8);
   uint8_t x35 = (uint8_t)(x32 & UINT8_C(0xff));
-  fiat_p256_uint1 x36 = (fiat_p256_uint1)((int64_t)x34 >> 8);
+  fiat_p256_uint1 x36 = (fiat_p256_uint1)(x34 >> 8);
   uint8_t x37 = (uint8_t)(x34 & UINT8_C(0xff));
   uint64_t x38 = (x36 + x2);
   uint64_t x39 = (x38 >> 8);
@@ -1217,7 +1217,7 @@ static void fiat_p256_to_bytes(uint8_t out1[32], const uint64_t arg1[4]) {
   uint8_t x50 = (uint8_t)(x47 & UINT8_C(0xff));
   uint8_t x51 = (uint8_t)(x49 >> 8);
   uint8_t x52 = (uint8_t)(x49 & UINT8_C(0xff));
-  fiat_p256_uint1 x53 = (fiat_p256_uint1)((int64_t)x51 >> 8);
+  fiat_p256_uint1 x53 = (fiat_p256_uint1)(x51 >> 8);
   uint8_t x54 = (uint8_t)(x51 & UINT8_C(0xff));
   uint64_t x55 = (x53 + x1);
   uint64_t x56 = (x55 >> 8);