samoht/Makefile Secret

## README.md

      
    Raw
  

              README.md
            
          
    To reproduce

$ make


## main.c
#define LIMBS 4
#define WORD uint64_t
#define WORDSIZE 64
#define LEN_PRIME 256
#define CURVE_DESCRIPTION fiat_p256

#include "p256_64.h"

int printf(const char *, ...);

static __inline__ void _fiat_p256_addcarryx_u64(uint64_t* out1, fiat_p256_uint1* out2, fiat_p256_uint1 arg1, uint64_t arg2, uint64_t arg3) {
  fiat_p256_uint128 x1;
  uint64_t x2;
  fiat_p256_uint1 x3;
  x1 = ((arg1 + (fiat_p256_uint128)arg2) + arg3);
  x2 = (uint64_t)(x1 & UINT64_C(0xffffffffffffffff));
  x3 = (fiat_p256_uint1)(x1 >> 64);
  *out1 = x2;
  *out2 = x3;
}

static __inline__ void _fiat_p256_divstep(uint64_t* out1, uint64_t out2[5], uint64_t out3[5], uint64_t out4[4], uint64_t out5[4], uint64_t arg1, const uint64_t arg2[5], const uint64_t arg3[5], const uint64_t arg4[4], const uint64_t arg5[4]) {
  printf ("---\n");
}

int main (void) {
  uint64_t g[5];
  WORD d, out1;
  WORD f[5];
  WORD v[4];
  WORD r[4];
  WORD out2[5], out3[5], out4[4], out5[4];

  d=UINT64_C(1);
  f[0]=UINT64_C(18446744073709551615);
  f[1]=UINT64_C(4294967295);
  f[2]=UINT64_C(0);
  f[3]=UINT64_C(18446744069414584321);
  f[4]=UINT64_C(0);
  g[0]=UINT64_C(3164219169453123020);
  g[1]=UINT64_C(5610335456920920796);
  g[2]=UINT64_C(4531946527682827593);
  g[3]=UINT64_C(17678136164097313971);
  g[4]=UINT64_C(0);
  v[0]=UINT64_C(0);
  v[1]=UINT64_C(0);
  v[2]=UINT64_C(0);
  v[3]=UINT64_C(0);
  r[0]=UINT64_C(1);
  r[1]=UINT64_C(18446744069414584320);
  r[2]=UINT64_C(18446744073709551615);
  r[3]=UINT64_C(4294967294);

  out1=0;
  out2[0]=0;
  out2[1]=0;
  out2[2]=0;
  out2[3]=0;
  out2[4]=0;
  out3[0]=0;
  out3[1]=0;
  out3[2]=0;
  out3[3]=0;
  out3[4]=0;
  out4[0]=0;
  out4[1]=0;
  out4[2]=0;
  out4[3]=0;
  out5[0]=0;
  out5[1]=0;
  out5[2]=0;
  out5[3]=0;

  fiat_p256_divstep(&out1,out2,out3,out4,out5,d,f,g,v,r);
  fiat_p256_divstep(&d,f,g,v,r,out1,out2,out3,out4,out5);

  // f[2] = UINT64_C(0); // CHANGE FAIL TO PASS

  // fiat_p256_divstep(&out1,out2,out3,out4,out5,d,f,g,v,r);
  uint64_t x12;
  fiat_p256_uint1 x13;
  uint64_t x14;
  fiat_p256_uint1 x15;
  uint64_t x16;
  fiat_p256_uint1 x17;
  uint64_t x18;
  fiat_p256_uint1 x19;
  fiat_p256_uint128 _x1;
  uint64_t _x2;
  fiat_p256_uint1 _x3;

  fiat_p256_addcarryx_u64(&x12, &x13, 0x0, 0x1, (~(f[0])));
  fiat_p256_addcarryx_u64(&x14, &x15, x13, 0x0, (~(f[1])));
  fiat_p256_addcarryx_u64(&x16, &x17, x15, 0x0, (~(f[2])));
  fiat_p256_addcarryx_u64(&x18, &x19, x17, 0x0, (~(f[3])));
  // fiat_p256_addcarryx_u64(&x20, &x21, x19, 0x0, (~(f[4])));
  _x1 = ((x19 + (fiat_p256_uint128)0x0) + (~(f[4])));
  _x2 = (uint64_t)(_x1 & UINT64_C(0xffffffffffffffff));

  if (_x2 != UINT64_C(18446744073709551615)) {
    printf("FAIL\n");
    return 1;
  }

  printf("PASS\n");
  return 0;
}

## Makefile
CLANG_OK=/opt/homebrew/Cellar/llvm/16.0.4/bin/clang
CLANG=/usr/bin/clang

all: repro-ok.exe repro-ko.exe repro-ok.s repro-ko.s
	./repro-ok.exe
	./repro-ko.exe

repro-ok.exe: *.c *.h
	# clang -fsanitize=undefined,address main.c -o repro-ok.exe -O1
	# clang main.c -o repro-ok.exe -O0
	# $(CLANG) main.c -O1 -o repro-ok.exe -mllvm --instcombine-max-iterations=0
	$(CLANG_OK) main.c -O1 -o repro-ok.exe \
	  -mllvm --instcombine-max-iterations=1 \
	  -mllvm --instcombine-max-num-phis=0 \
	  -mllvm --instcombine-max-sink-users=0 \
	  -mllvm --instcombine-maxarray-size=0 \
	  -mllvm --instcombine-negator-max-depth=0

repro-ko.exe: *.c *.h
	$(CLANG) main.c -O1 -o repro-ko.exe \
	  -mllvm --instcombine-max-iterations=1 \
	  -mllvm --instcombine-max-num-phis=0 \
	  -mllvm --instcombine-max-sink-users=0 \
	  -mllvm --instcombine-maxarray-size=0 \
	  -mllvm --instcombine-negator-max-depth=0

bissect:
	$(CLANG) main.c -O1 -o repro.exe -mllvm -opt-bisect-limit=180 && ./repro.exe

repro-ok.s: repro-ok.exe
	objdump -M intel -d repro-ok.exe > repro-ok.s

repro-ko.s: repro-ko.exe
	objdump -M intel -d repro-ko.exe > repro-ko.s

## p256_64.h
#include <stdint.h>
typedef unsigned char fiat_p256_uint1;
typedef signed char fiat_p256_int1;
#if defined(__GNUC__) || defined(__clang__)
#  define FIAT_P256_FIAT_EXTENSION __extension__
#  define FIAT_P256_FIAT_INLINE __inline__
#else
#  define FIAT_P256_FIAT_EXTENSION
#  define FIAT_P256_FIAT_INLINE
#endif

FIAT_P256_FIAT_EXTENSION typedef signed __int128 fiat_p256_int128;
FIAT_P256_FIAT_EXTENSION typedef unsigned __int128 fiat_p256_uint128;

typedef uint64_t fiat_p256_montgomery_domain_field_element[4];
typedef uint64_t fiat_p256_non_montgomery_domain_field_element[4];

#if (-1 & 3) != 3
#error "This code only works on a two's complement system"
#endif

#if !defined(FIAT_P256_NO_ASM) && (defined(__GNUC__) || defined(__clang__))
static __inline__ uint64_t fiat_p256_value_barrier_u64(uint64_t a) {
  __asm__("" : "+r"(a) : /* no inputs */);
  return a;
}
#else
#  define fiat_p256_value_barrier_u64(x) (x)
#endif

static FIAT_P256_FIAT_INLINE void fiat_p256_addcarryx_u64(uint64_t* out1, fiat_p256_uint1* out2, fiat_p256_uint1 arg1, uint64_t arg2, uint64_t arg3) {
  fiat_p256_uint128 x1;
  uint64_t x2;
  fiat_p256_uint1 x3;
  x1 = ((arg1 + (fiat_p256_uint128)arg2) + arg3);
  x2 = (uint64_t)(x1 & UINT64_C(0xffffffffffffffff));
  x3 = (fiat_p256_uint1)(x1 >> 64);
  *out1 = x2;
  *out2 = x3;
}

static FIAT_P256_FIAT_INLINE 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;
  fiat_p256_int1 x2;
  uint64_t x3;
  x1 = ((arg2 - (fiat_p256_int128)arg1) - arg3);
  x2 = (fiat_p256_int1)(x1 >> 64);
  x3 = (uint64_t)(x1 & UINT64_C(0xffffffffffffffff));
  *out1 = x3;
  *out2 = (fiat_p256_uint1)(0x0 - x2);
}

static FIAT_P256_FIAT_INLINE void fiat_p256_cmovznz_u64(uint64_t* out1, fiat_p256_uint1 arg1, uint64_t arg2, uint64_t arg3) {
  fiat_p256_uint1 x1;
  uint64_t x2;
  uint64_t x3;
  x1 = (!(!arg1));
  x2 = ((fiat_p256_int1)(0x0 - x1) & UINT64_C(0xffffffffffffffff));
  x3 = ((fiat_p256_value_barrier_u64(x2) & arg3) | (fiat_p256_value_barrier_u64((~x2)) & arg2));
  *out1 = x3;
}

static FIAT_P256_FIAT_INLINE void fiat_p256_divstep(uint64_t* out1, uint64_t out2[5], uint64_t out3[5], uint64_t out4[4], uint64_t out5[4], uint64_t arg1, const uint64_t arg2[5], const uint64_t arg3[5], const uint64_t arg4[4], const uint64_t arg5[4]) {
  uint64_t x1;
  fiat_p256_uint1 x2;
  fiat_p256_uint1 x3;
  uint64_t x4;
  fiat_p256_uint1 x5;
  uint64_t x6;
  uint64_t x7;
  uint64_t x8;
  uint64_t x9;
  uint64_t x10;
  uint64_t x11;
  uint64_t x12;
  fiat_p256_uint1 x13;
  uint64_t x14;
  fiat_p256_uint1 x15;
  uint64_t x16;
  fiat_p256_uint1 x17;
  uint64_t x18;
  fiat_p256_uint1 x19;
  uint64_t x20;
  fiat_p256_uint1 x21;
  uint64_t x22;
  uint64_t x23;
  uint64_t x24;
  uint64_t x25;
  uint64_t x26;
  uint64_t x27;
  uint64_t x28;
  uint64_t x29;
  uint64_t x30;
  uint64_t x31;
  fiat_p256_uint1 x32;
  uint64_t x33;
  fiat_p256_uint1 x34;
  uint64_t x35;
  fiat_p256_uint1 x36;
  uint64_t x37;
  fiat_p256_uint1 x38;
  uint64_t x39;
  fiat_p256_uint1 x40;
  uint64_t x41;
  fiat_p256_uint1 x42;
  uint64_t x43;
  fiat_p256_uint1 x44;
  uint64_t x45;
  fiat_p256_uint1 x46;
  uint64_t x47;
  fiat_p256_uint1 x48;
  uint64_t x49;
  uint64_t x50;
  uint64_t x51;
  uint64_t x52;
  uint64_t x53;
  fiat_p256_uint1 x54;
  uint64_t x55;
  fiat_p256_uint1 x56;
  uint64_t x57;
  fiat_p256_uint1 x58;
  uint64_t x59;
  fiat_p256_uint1 x60;
  uint64_t x61;
  uint64_t x62;
  fiat_p256_uint1 x63;
  uint64_t x64;
  fiat_p256_uint1 x65;
  uint64_t x66;
  fiat_p256_uint1 x67;
  uint64_t x68;
  fiat_p256_uint1 x69;
  uint64_t x70;
  uint64_t x71;
  uint64_t x72;
  uint64_t x73;
  fiat_p256_uint1 x74;
  uint64_t x75;
  uint64_t x76;
  uint64_t x77;
  uint64_t x78;
  uint64_t x79;
  uint64_t x80;
  fiat_p256_uint1 x81;
  uint64_t x82;
  fiat_p256_uint1 x83;
  uint64_t x84;
  fiat_p256_uint1 x85;
  uint64_t x86;
  fiat_p256_uint1 x87;
  uint64_t x88;
  fiat_p256_uint1 x89;
  uint64_t x90;
  uint64_t x91;
  uint64_t x92;
  uint64_t x93;
  uint64_t x94;
  fiat_p256_uint1 x95;
  uint64_t x96;
  fiat_p256_uint1 x97;
  uint64_t x98;
  fiat_p256_uint1 x99;
  uint64_t x100;
  fiat_p256_uint1 x101;
  uint64_t x102;
  fiat_p256_uint1 x103;
  uint64_t x104;
  fiat_p256_uint1 x105;
  uint64_t x106;
  fiat_p256_uint1 x107;
  uint64_t x108;
  fiat_p256_uint1 x109;
  uint64_t x110;
  fiat_p256_uint1 x111;
  uint64_t x112;
  fiat_p256_uint1 x113;
  uint64_t x114;
  uint64_t x115;
  uint64_t x116;
  uint64_t x117;
  uint64_t x118;
  uint64_t x119;
  uint64_t x120;
  uint64_t x121;
  uint64_t x122;
  uint64_t x123;
  uint64_t x124;
  uint64_t x125;
  uint64_t x126;
  fiat_p256_addcarryx_u64(&x1, &x2, 0x0, (~arg1), 0x1);
  x3 = (fiat_p256_uint1)((fiat_p256_uint1)(x1 >> 63) & (fiat_p256_uint1)((arg3[0]) & 0x1));
  fiat_p256_addcarryx_u64(&x4, &x5, 0x0, (~arg1), 0x1);
  fiat_p256_cmovznz_u64(&x6, x3, arg1, x4);
  fiat_p256_cmovznz_u64(&x7, x3, (arg2[0]), (arg3[0]));
  fiat_p256_cmovznz_u64(&x8, x3, (arg2[1]), (arg3[1]));
  fiat_p256_cmovznz_u64(&x9, x3, (arg2[2]), (arg3[2]));
  fiat_p256_cmovznz_u64(&x10, x3, (arg2[3]), (arg3[3]));
  fiat_p256_cmovznz_u64(&x11, x3, (arg2[4]), (arg3[4]));
  fiat_p256_addcarryx_u64(&x12, &x13, 0x0, 0x1, (~(arg2[0])));
  fiat_p256_addcarryx_u64(&x14, &x15, x13, 0x0, (~(arg2[1])));
  fiat_p256_addcarryx_u64(&x16, &x17, x15, 0x0, (~(arg2[2])));
  fiat_p256_addcarryx_u64(&x18, &x19, x17, 0x0, (~(arg2[3])));
  fiat_p256_addcarryx_u64(&x20, &x21, x19, 0x0, (~(arg2[4])));
  fiat_p256_cmovznz_u64(&x22, x3, (arg3[0]), x12);
  fiat_p256_cmovznz_u64(&x23, x3, (arg3[1]), x14);
  fiat_p256_cmovznz_u64(&x24, x3, (arg3[2]), x16);
  fiat_p256_cmovznz_u64(&x25, x3, (arg3[3]), x18);
  fiat_p256_cmovznz_u64(&x26, x3, (arg3[4]), x20);
  fiat_p256_cmovznz_u64(&x27, x3, (arg4[0]), (arg5[0]));
  fiat_p256_cmovznz_u64(&x28, x3, (arg4[1]), (arg5[1]));
  fiat_p256_cmovznz_u64(&x29, x3, (arg4[2]), (arg5[2]));
  fiat_p256_cmovznz_u64(&x30, x3, (arg4[3]), (arg5[3]));
  fiat_p256_addcarryx_u64(&x31, &x32, 0x0, x27, x27);
  fiat_p256_addcarryx_u64(&x33, &x34, x32, x28, x28);
  fiat_p256_addcarryx_u64(&x35, &x36, x34, x29, x29);
  fiat_p256_addcarryx_u64(&x37, &x38, x36, x30, x30);
  fiat_p256_subborrowx_u64(&x39, &x40, 0x0, x31, UINT64_C(0xffffffffffffffff));
  fiat_p256_subborrowx_u64(&x41, &x42, x40, x33, UINT32_C(0xffffffff));
  fiat_p256_subborrowx_u64(&x43, &x44, x42, x35, 0x0);
  fiat_p256_subborrowx_u64(&x45, &x46, x44, x37, UINT64_C(0xffffffff00000001));
  fiat_p256_subborrowx_u64(&x47, &x48, x46, x38, 0x0);
  x49 = (arg4[3]);
  x50 = (arg4[2]);
  x51 = (arg4[1]);
  x52 = (arg4[0]);
  fiat_p256_subborrowx_u64(&x53, &x54, 0x0, 0x0, x52);
  fiat_p256_subborrowx_u64(&x55, &x56, x54, 0x0, x51);
  fiat_p256_subborrowx_u64(&x57, &x58, x56, 0x0, x50);
  fiat_p256_subborrowx_u64(&x59, &x60, x58, 0x0, x49);
  fiat_p256_cmovznz_u64(&x61, x60, 0x0, UINT64_C(0xffffffffffffffff));
  fiat_p256_addcarryx_u64(&x62, &x63, 0x0, x53, x61);
  fiat_p256_addcarryx_u64(&x64, &x65, x63, x55, (x61 & UINT32_C(0xffffffff)));
  fiat_p256_addcarryx_u64(&x66, &x67, x65, x57, 0x0);
  fiat_p256_addcarryx_u64(&x68, &x69, x67, x59, (x61 & UINT64_C(0xffffffff00000001)));
  fiat_p256_cmovznz_u64(&x70, x3, (arg5[0]), x62);
  fiat_p256_cmovznz_u64(&x71, x3, (arg5[1]), x64);
  fiat_p256_cmovznz_u64(&x72, x3, (arg5[2]), x66);
  fiat_p256_cmovznz_u64(&x73, x3, (arg5[3]), x68);
  x74 = (fiat_p256_uint1)(x22 & 0x1);
  fiat_p256_cmovznz_u64(&x75, x74, 0x0, x7);
  fiat_p256_cmovznz_u64(&x76, x74, 0x0, x8);
  fiat_p256_cmovznz_u64(&x77, x74, 0x0, x9);
  fiat_p256_cmovznz_u64(&x78, x74, 0x0, x10);
  fiat_p256_cmovznz_u64(&x79, x74, 0x0, x11);
  fiat_p256_addcarryx_u64(&x80, &x81, 0x0, x22, x75);
  fiat_p256_addcarryx_u64(&x82, &x83, x81, x23, x76);
  fiat_p256_addcarryx_u64(&x84, &x85, x83, x24, x77);
  fiat_p256_addcarryx_u64(&x86, &x87, x85, x25, x78);
  fiat_p256_addcarryx_u64(&x88, &x89, x87, x26, x79);
  fiat_p256_cmovznz_u64(&x90, x74, 0x0, x27);
  fiat_p256_cmovznz_u64(&x91, x74, 0x0, x28);
  fiat_p256_cmovznz_u64(&x92, x74, 0x0, x29);
  fiat_p256_cmovznz_u64(&x93, x74, 0x0, x30);
  fiat_p256_addcarryx_u64(&x94, &x95, 0x0, x70, x90);
  fiat_p256_addcarryx_u64(&x96, &x97, x95, x71, x91);
  fiat_p256_addcarryx_u64(&x98, &x99, x97, x72, x92);
  fiat_p256_addcarryx_u64(&x100, &x101, x99, x73, x93);
  fiat_p256_subborrowx_u64(&x102, &x103, 0x0, x94, UINT64_C(0xffffffffffffffff));
  fiat_p256_subborrowx_u64(&x104, &x105, x103, x96, UINT32_C(0xffffffff));
  fiat_p256_subborrowx_u64(&x106, &x107, x105, x98, 0x0);
  fiat_p256_subborrowx_u64(&x108, &x109, x107, x100, UINT64_C(0xffffffff00000001));
  fiat_p256_subborrowx_u64(&x110, &x111, x109, x101, 0x0);
  fiat_p256_addcarryx_u64(&x112, &x113, 0x0, x6, 0x1);
  x114 = ((x80 >> 1) | ((x82 << 63) & UINT64_C(0xffffffffffffffff)));
  x115 = ((x82 >> 1) | ((x84 << 63) & UINT64_C(0xffffffffffffffff)));
  x116 = ((x84 >> 1) | ((x86 << 63) & UINT64_C(0xffffffffffffffff)));
  x117 = ((x86 >> 1) | ((x88 << 63) & UINT64_C(0xffffffffffffffff)));
  x118 = ((x88 & UINT64_C(0x8000000000000000)) | (x88 >> 1));
  fiat_p256_cmovznz_u64(&x119, x48, x39, x31);
  fiat_p256_cmovznz_u64(&x120, x48, x41, x33);
  fiat_p256_cmovznz_u64(&x121, x48, x43, x35);
  fiat_p256_cmovznz_u64(&x122, x48, x45, x37);
  fiat_p256_cmovznz_u64(&x123, x111, x102, x94);
  fiat_p256_cmovznz_u64(&x124, x111, x104, x96);
  fiat_p256_cmovznz_u64(&x125, x111, x106, x98);
  fiat_p256_cmovznz_u64(&x126, x111, x108, x100);
  *out1 = x112;
  out2[0] = x7;
  out2[1] = x8;
  out2[2] = x9;
  out2[3] = x10;
  out2[4] = x11;
  out3[0] = x114;
  out3[1] = x115;
  out3[2] = x116;
  out3[3] = x117;
  out3[4] = x118;
  out4[0] = x119;
  out4[1] = x120;
  out4[2] = x121;
  out4[3] = x122;
  out5[0] = x123;
  out5[1] = x124;
  out5[2] = x125;
  out5[3] = x126;
}

## repro-ko.exe

      
    Raw
  

              repro-ko.exe
            
          
            View raw
        
    
## repro-ok.exe

      
    Raw
  

              repro-ok.exe
            
          
            View raw
	#define LIMBS 4
	#define WORD uint64_t
	#define WORDSIZE 64
	#define LEN_PRIME 256
	#define CURVE_DESCRIPTION fiat_p256

	#include "p256_64.h"

	int printf(const char *, ...);

	static __inline__ void _fiat_p256_addcarryx_u64(uint64_t* out1, fiat_p256_uint1* out2, fiat_p256_uint1 arg1, uint64_t arg2, uint64_t arg3) {
	fiat_p256_uint128 x1;
	uint64_t x2;
	fiat_p256_uint1 x3;
	x1 = ((arg1 + (fiat_p256_uint128)arg2) + arg3);
	x2 = (uint64_t)(x1 & UINT64_C(0xffffffffffffffff));
	x3 = (fiat_p256_uint1)(x1 >> 64);
	*out1 = x2;
	*out2 = x3;
	}

	static __inline__ void _fiat_p256_divstep(uint64_t* out1, uint64_t out2[5], uint64_t out3[5], uint64_t out4[4], uint64_t out5[4], uint64_t arg1, const uint64_t arg2[5], const uint64_t arg3[5], const uint64_t arg4[4], const uint64_t arg5[4]) {
	printf ("---\n");
	}

	int main (void) {
	uint64_t g[5];
	WORD d, out1;
	WORD f[5];
	WORD v[4];
	WORD r[4];
	WORD out2[5], out3[5], out4[4], out5[4];

	d=UINT64_C(1);
	f[0]=UINT64_C(18446744073709551615);
	f[1]=UINT64_C(4294967295);
	f[2]=UINT64_C(0);
	f[3]=UINT64_C(18446744069414584321);
	f[4]=UINT64_C(0);
	g[0]=UINT64_C(3164219169453123020);
	g[1]=UINT64_C(5610335456920920796);
	g[2]=UINT64_C(4531946527682827593);
	g[3]=UINT64_C(17678136164097313971);
	g[4]=UINT64_C(0);
	v[0]=UINT64_C(0);
	v[1]=UINT64_C(0);
	v[2]=UINT64_C(0);
	v[3]=UINT64_C(0);
	r[0]=UINT64_C(1);
	r[1]=UINT64_C(18446744069414584320);
	r[2]=UINT64_C(18446744073709551615);
	r[3]=UINT64_C(4294967294);

	out1=0;
	out2[0]=0;
	out2[1]=0;
	out2[2]=0;
	out2[3]=0;
	out2[4]=0;
	out3[0]=0;
	out3[1]=0;
	out3[2]=0;
	out3[3]=0;
	out3[4]=0;
	out4[0]=0;
	out4[1]=0;
	out4[2]=0;
	out4[3]=0;
	out5[0]=0;
	out5[1]=0;
	out5[2]=0;
	out5[3]=0;

	fiat_p256_divstep(&out1,out2,out3,out4,out5,d,f,g,v,r);
	fiat_p256_divstep(&d,f,g,v,r,out1,out2,out3,out4,out5);

	// f[2] = UINT64_C(0); // CHANGE FAIL TO PASS

	// fiat_p256_divstep(&out1,out2,out3,out4,out5,d,f,g,v,r);
	uint64_t x12;
	fiat_p256_uint1 x13;
	uint64_t x14;
	fiat_p256_uint1 x15;
	uint64_t x16;
	fiat_p256_uint1 x17;
	uint64_t x18;
	fiat_p256_uint1 x19;
	fiat_p256_uint128 _x1;
	uint64_t _x2;
	fiat_p256_uint1 _x3;

	fiat_p256_addcarryx_u64(&x12, &x13, 0x0, 0x1, (~(f[0])));
	fiat_p256_addcarryx_u64(&x14, &x15, x13, 0x0, (~(f[1])));
	fiat_p256_addcarryx_u64(&x16, &x17, x15, 0x0, (~(f[2])));
	fiat_p256_addcarryx_u64(&x18, &x19, x17, 0x0, (~(f[3])));
	// fiat_p256_addcarryx_u64(&x20, &x21, x19, 0x0, (~(f[4])));
	_x1 = ((x19 + (fiat_p256_uint128)0x0) + (~(f[4])));
	_x2 = (uint64_t)(_x1 & UINT64_C(0xffffffffffffffff));

	if (_x2 != UINT64_C(18446744073709551615)) {
	printf("FAIL\n");
	return 1;
	}

	printf("PASS\n");
	return 0;
	}
	CLANG_OK=/opt/homebrew/Cellar/llvm/16.0.4/bin/clang
	CLANG=/usr/bin/clang

	all: repro-ok.exe repro-ko.exe repro-ok.s repro-ko.s
	./repro-ok.exe
	./repro-ko.exe

	repro-ok.exe: .c .h
	# clang -fsanitize=undefined,address main.c -o repro-ok.exe -O1
	# clang main.c -o repro-ok.exe -O0
	# $(CLANG) main.c -O1 -o repro-ok.exe -mllvm --instcombine-max-iterations=0
	$(CLANG_OK) main.c -O1 -o repro-ok.exe \
	-mllvm --instcombine-max-iterations=1 \
	-mllvm --instcombine-max-num-phis=0 \
	-mllvm --instcombine-max-sink-users=0 \
	-mllvm --instcombine-maxarray-size=0 \
	-mllvm --instcombine-negator-max-depth=0

	repro-ko.exe: .c .h
	$(CLANG) main.c -O1 -o repro-ko.exe \
	-mllvm --instcombine-max-iterations=1 \
	-mllvm --instcombine-max-num-phis=0 \
	-mllvm --instcombine-max-sink-users=0 \
	-mllvm --instcombine-maxarray-size=0 \
	-mllvm --instcombine-negator-max-depth=0

	bissect:
	$(CLANG) main.c -O1 -o repro.exe -mllvm -opt-bisect-limit=180 && ./repro.exe

	repro-ok.s: repro-ok.exe
	objdump -M intel -d repro-ok.exe > repro-ok.s

	repro-ko.s: repro-ko.exe
	objdump -M intel -d repro-ko.exe > repro-ko.s
	#include <stdint.h>
	typedef unsigned char fiat_p256_uint1;
	typedef signed char fiat_p256_int1;
	#if defined(__GNUC__) \|\| defined(__clang__)
	# define FIAT_P256_FIAT_EXTENSION __extension__
	# define FIAT_P256_FIAT_INLINE __inline__
	#else
	# define FIAT_P256_FIAT_EXTENSION
	# define FIAT_P256_FIAT_INLINE
	#endif

	FIAT_P256_FIAT_EXTENSION typedef signed __int128 fiat_p256_int128;
	FIAT_P256_FIAT_EXTENSION typedef unsigned __int128 fiat_p256_uint128;

	typedef uint64_t fiat_p256_montgomery_domain_field_element[4];
	typedef uint64_t fiat_p256_non_montgomery_domain_field_element[4];

	#if (-1 & 3) != 3
	#error "This code only works on a two's complement system"
	#endif

	#if !defined(FIAT_P256_NO_ASM) && (defined(__GNUC__) \|\| defined(__clang__))
	static __inline__ uint64_t fiat_p256_value_barrier_u64(uint64_t a) {
	__asm__("" : "+r"(a) : /* no inputs */);
	return a;
	}
	#else
	# define fiat_p256_value_barrier_u64(x) (x)
	#endif

	static FIAT_P256_FIAT_INLINE void fiat_p256_addcarryx_u64(uint64_t* out1, fiat_p256_uint1* out2, fiat_p256_uint1 arg1, uint64_t arg2, uint64_t arg3) {
	fiat_p256_uint128 x1;
	uint64_t x2;
	fiat_p256_uint1 x3;
	x1 = ((arg1 + (fiat_p256_uint128)arg2) + arg3);
	x2 = (uint64_t)(x1 & UINT64_C(0xffffffffffffffff));
	x3 = (fiat_p256_uint1)(x1 >> 64);
	*out1 = x2;
	*out2 = x3;
	}

	static FIAT_P256_FIAT_INLINE 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;
	fiat_p256_int1 x2;
	uint64_t x3;
	x1 = ((arg2 - (fiat_p256_int128)arg1) - arg3);
	x2 = (fiat_p256_int1)(x1 >> 64);
	x3 = (uint64_t)(x1 & UINT64_C(0xffffffffffffffff));
	*out1 = x3;
	*out2 = (fiat_p256_uint1)(0x0 - x2);
	}

	static FIAT_P256_FIAT_INLINE void fiat_p256_cmovznz_u64(uint64_t* out1, fiat_p256_uint1 arg1, uint64_t arg2, uint64_t arg3) {
	fiat_p256_uint1 x1;
	uint64_t x2;
	uint64_t x3;
	x1 = (!(!arg1));
	x2 = ((fiat_p256_int1)(0x0 - x1) & UINT64_C(0xffffffffffffffff));
	x3 = ((fiat_p256_value_barrier_u64(x2) & arg3) \| (fiat_p256_value_barrier_u64((~x2)) & arg2));
	*out1 = x3;
	}

	static FIAT_P256_FIAT_INLINE void fiat_p256_divstep(uint64_t* out1, uint64_t out2[5], uint64_t out3[5], uint64_t out4[4], uint64_t out5[4], uint64_t arg1, const uint64_t arg2[5], const uint64_t arg3[5], const uint64_t arg4[4], const uint64_t arg5[4]) {
	uint64_t x1;
	fiat_p256_uint1 x2;
	fiat_p256_uint1 x3;
	uint64_t x4;
	fiat_p256_uint1 x5;
	uint64_t x6;
	uint64_t x7;
	uint64_t x8;
	uint64_t x9;
	uint64_t x10;
	uint64_t x11;
	uint64_t x12;
	fiat_p256_uint1 x13;
	uint64_t x14;
	fiat_p256_uint1 x15;
	uint64_t x16;
	fiat_p256_uint1 x17;
	uint64_t x18;
	fiat_p256_uint1 x19;
	uint64_t x20;
	fiat_p256_uint1 x21;
	uint64_t x22;
	uint64_t x23;
	uint64_t x24;
	uint64_t x25;
	uint64_t x26;
	uint64_t x27;
	uint64_t x28;
	uint64_t x29;
	uint64_t x30;
	uint64_t x31;
	fiat_p256_uint1 x32;
	uint64_t x33;
	fiat_p256_uint1 x34;
	uint64_t x35;
	fiat_p256_uint1 x36;
	uint64_t x37;
	fiat_p256_uint1 x38;
	uint64_t x39;
	fiat_p256_uint1 x40;
	uint64_t x41;
	fiat_p256_uint1 x42;
	uint64_t x43;
	fiat_p256_uint1 x44;
	uint64_t x45;
	fiat_p256_uint1 x46;
	uint64_t x47;
	fiat_p256_uint1 x48;
	uint64_t x49;
	uint64_t x50;
	uint64_t x51;
	uint64_t x52;
	uint64_t x53;
	fiat_p256_uint1 x54;
	uint64_t x55;
	fiat_p256_uint1 x56;
	uint64_t x57;
	fiat_p256_uint1 x58;
	uint64_t x59;
	fiat_p256_uint1 x60;
	uint64_t x61;
	uint64_t x62;
	fiat_p256_uint1 x63;
	uint64_t x64;
	fiat_p256_uint1 x65;
	uint64_t x66;
	fiat_p256_uint1 x67;
	uint64_t x68;
	fiat_p256_uint1 x69;
	uint64_t x70;
	uint64_t x71;
	uint64_t x72;
	uint64_t x73;
	fiat_p256_uint1 x74;
	uint64_t x75;
	uint64_t x76;
	uint64_t x77;
	uint64_t x78;
	uint64_t x79;
	uint64_t x80;
	fiat_p256_uint1 x81;
	uint64_t x82;
	fiat_p256_uint1 x83;
	uint64_t x84;
	fiat_p256_uint1 x85;
	uint64_t x86;
	fiat_p256_uint1 x87;
	uint64_t x88;
	fiat_p256_uint1 x89;
	uint64_t x90;
	uint64_t x91;
	uint64_t x92;
	uint64_t x93;
	uint64_t x94;
	fiat_p256_uint1 x95;
	uint64_t x96;
	fiat_p256_uint1 x97;
	uint64_t x98;
	fiat_p256_uint1 x99;
	uint64_t x100;
	fiat_p256_uint1 x101;
	uint64_t x102;
	fiat_p256_uint1 x103;
	uint64_t x104;
	fiat_p256_uint1 x105;
	uint64_t x106;
	fiat_p256_uint1 x107;
	uint64_t x108;
	fiat_p256_uint1 x109;
	uint64_t x110;
	fiat_p256_uint1 x111;
	uint64_t x112;
	fiat_p256_uint1 x113;
	uint64_t x114;
	uint64_t x115;
	uint64_t x116;
	uint64_t x117;
	uint64_t x118;
	uint64_t x119;
	uint64_t x120;
	uint64_t x121;
	uint64_t x122;
	uint64_t x123;
	uint64_t x124;
	uint64_t x125;
	uint64_t x126;
	fiat_p256_addcarryx_u64(&x1, &x2, 0x0, (~arg1), 0x1);
	x3 = (fiat_p256_uint1)((fiat_p256_uint1)(x1 >> 63) & (fiat_p256_uint1)((arg3[0]) & 0x1));
	fiat_p256_addcarryx_u64(&x4, &x5, 0x0, (~arg1), 0x1);
	fiat_p256_cmovznz_u64(&x6, x3, arg1, x4);
	fiat_p256_cmovznz_u64(&x7, x3, (arg2[0]), (arg3[0]));
	fiat_p256_cmovznz_u64(&x8, x3, (arg2[1]), (arg3[1]));
	fiat_p256_cmovznz_u64(&x9, x3, (arg2[2]), (arg3[2]));
	fiat_p256_cmovznz_u64(&x10, x3, (arg2[3]), (arg3[3]));
	fiat_p256_cmovznz_u64(&x11, x3, (arg2[4]), (arg3[4]));
	fiat_p256_addcarryx_u64(&x12, &x13, 0x0, 0x1, (~(arg2[0])));
	fiat_p256_addcarryx_u64(&x14, &x15, x13, 0x0, (~(arg2[1])));
	fiat_p256_addcarryx_u64(&x16, &x17, x15, 0x0, (~(arg2[2])));
	fiat_p256_addcarryx_u64(&x18, &x19, x17, 0x0, (~(arg2[3])));
	fiat_p256_addcarryx_u64(&x20, &x21, x19, 0x0, (~(arg2[4])));
	fiat_p256_cmovznz_u64(&x22, x3, (arg3[0]), x12);
	fiat_p256_cmovznz_u64(&x23, x3, (arg3[1]), x14);
	fiat_p256_cmovznz_u64(&x24, x3, (arg3[2]), x16);
	fiat_p256_cmovznz_u64(&x25, x3, (arg3[3]), x18);
	fiat_p256_cmovznz_u64(&x26, x3, (arg3[4]), x20);
	fiat_p256_cmovznz_u64(&x27, x3, (arg4[0]), (arg5[0]));
	fiat_p256_cmovznz_u64(&x28, x3, (arg4[1]), (arg5[1]));
	fiat_p256_cmovznz_u64(&x29, x3, (arg4[2]), (arg5[2]));
	fiat_p256_cmovznz_u64(&x30, x3, (arg4[3]), (arg5[3]));
	fiat_p256_addcarryx_u64(&x31, &x32, 0x0, x27, x27);
	fiat_p256_addcarryx_u64(&x33, &x34, x32, x28, x28);
	fiat_p256_addcarryx_u64(&x35, &x36, x34, x29, x29);
	fiat_p256_addcarryx_u64(&x37, &x38, x36, x30, x30);
	fiat_p256_subborrowx_u64(&x39, &x40, 0x0, x31, UINT64_C(0xffffffffffffffff));
	fiat_p256_subborrowx_u64(&x41, &x42, x40, x33, UINT32_C(0xffffffff));
	fiat_p256_subborrowx_u64(&x43, &x44, x42, x35, 0x0);
	fiat_p256_subborrowx_u64(&x45, &x46, x44, x37, UINT64_C(0xffffffff00000001));
	fiat_p256_subborrowx_u64(&x47, &x48, x46, x38, 0x0);
	x49 = (arg4[3]);
	x50 = (arg4[2]);
	x51 = (arg4[1]);
	x52 = (arg4[0]);
	fiat_p256_subborrowx_u64(&x53, &x54, 0x0, 0x0, x52);
	fiat_p256_subborrowx_u64(&x55, &x56, x54, 0x0, x51);
	fiat_p256_subborrowx_u64(&x57, &x58, x56, 0x0, x50);
	fiat_p256_subborrowx_u64(&x59, &x60, x58, 0x0, x49);
	fiat_p256_cmovznz_u64(&x61, x60, 0x0, UINT64_C(0xffffffffffffffff));
	fiat_p256_addcarryx_u64(&x62, &x63, 0x0, x53, x61);
	fiat_p256_addcarryx_u64(&x64, &x65, x63, x55, (x61 & UINT32_C(0xffffffff)));
	fiat_p256_addcarryx_u64(&x66, &x67, x65, x57, 0x0);
	fiat_p256_addcarryx_u64(&x68, &x69, x67, x59, (x61 & UINT64_C(0xffffffff00000001)));
	fiat_p256_cmovznz_u64(&x70, x3, (arg5[0]), x62);
	fiat_p256_cmovznz_u64(&x71, x3, (arg5[1]), x64);
	fiat_p256_cmovznz_u64(&x72, x3, (arg5[2]), x66);
	fiat_p256_cmovznz_u64(&x73, x3, (arg5[3]), x68);
	x74 = (fiat_p256_uint1)(x22 & 0x1);
	fiat_p256_cmovznz_u64(&x75, x74, 0x0, x7);
	fiat_p256_cmovznz_u64(&x76, x74, 0x0, x8);
	fiat_p256_cmovznz_u64(&x77, x74, 0x0, x9);
	fiat_p256_cmovznz_u64(&x78, x74, 0x0, x10);
	fiat_p256_cmovznz_u64(&x79, x74, 0x0, x11);
	fiat_p256_addcarryx_u64(&x80, &x81, 0x0, x22, x75);
	fiat_p256_addcarryx_u64(&x82, &x83, x81, x23, x76);
	fiat_p256_addcarryx_u64(&x84, &x85, x83, x24, x77);
	fiat_p256_addcarryx_u64(&x86, &x87, x85, x25, x78);
	fiat_p256_addcarryx_u64(&x88, &x89, x87, x26, x79);
	fiat_p256_cmovznz_u64(&x90, x74, 0x0, x27);
	fiat_p256_cmovznz_u64(&x91, x74, 0x0, x28);
	fiat_p256_cmovznz_u64(&x92, x74, 0x0, x29);
	fiat_p256_cmovznz_u64(&x93, x74, 0x0, x30);
	fiat_p256_addcarryx_u64(&x94, &x95, 0x0, x70, x90);
	fiat_p256_addcarryx_u64(&x96, &x97, x95, x71, x91);
	fiat_p256_addcarryx_u64(&x98, &x99, x97, x72, x92);
	fiat_p256_addcarryx_u64(&x100, &x101, x99, x73, x93);
	fiat_p256_subborrowx_u64(&x102, &x103, 0x0, x94, UINT64_C(0xffffffffffffffff));
	fiat_p256_subborrowx_u64(&x104, &x105, x103, x96, UINT32_C(0xffffffff));
	fiat_p256_subborrowx_u64(&x106, &x107, x105, x98, 0x0);
	fiat_p256_subborrowx_u64(&x108, &x109, x107, x100, UINT64_C(0xffffffff00000001));
	fiat_p256_subborrowx_u64(&x110, &x111, x109, x101, 0x0);
	fiat_p256_addcarryx_u64(&x112, &x113, 0x0, x6, 0x1);
	x114 = ((x80 >> 1) \| ((x82 << 63) & UINT64_C(0xffffffffffffffff)));
	x115 = ((x82 >> 1) \| ((x84 << 63) & UINT64_C(0xffffffffffffffff)));
	x116 = ((x84 >> 1) \| ((x86 << 63) & UINT64_C(0xffffffffffffffff)));
	x117 = ((x86 >> 1) \| ((x88 << 63) & UINT64_C(0xffffffffffffffff)));
	x118 = ((x88 & UINT64_C(0x8000000000000000)) \| (x88 >> 1));
	fiat_p256_cmovznz_u64(&x119, x48, x39, x31);
	fiat_p256_cmovznz_u64(&x120, x48, x41, x33);
	fiat_p256_cmovznz_u64(&x121, x48, x43, x35);
	fiat_p256_cmovznz_u64(&x122, x48, x45, x37);
	fiat_p256_cmovznz_u64(&x123, x111, x102, x94);
	fiat_p256_cmovznz_u64(&x124, x111, x104, x96);
	fiat_p256_cmovznz_u64(&x125, x111, x106, x98);
	fiat_p256_cmovznz_u64(&x126, x111, x108, x100);
	*out1 = x112;
	out2[0] = x7;
	out2[1] = x8;
	out2[2] = x9;
	out2[3] = x10;
	out2[4] = x11;
	out3[0] = x114;
	out3[1] = x115;
	out3[2] = x116;
	out3[3] = x117;
	out3[4] = x118;
	out4[0] = x119;
	out4[1] = x120;
	out4[2] = x121;
	out4[3] = x122;
	out5[0] = x123;
	out5[1] = x124;
	out5[2] = x125;
	out5[3] = x126;
	}