builtins: Add support for clang compatible __builtin_{add,sub}c{,l,ll} [PR79173]

  Hi!

While the design of these builtins in clang is questionable,
rather than being say
unsigned __builtin_addc (unsigned, unsigned, bool, bool *)
so that it is clear they add two [0, 0xffffffff] range numbers
plus one [0, 1] range carry in and give [0, 0xffffffff] range
return plus [0, 1] range carry out, they actually instead
add 3 [0, 0xffffffff] values together but the carry out
isn't then the expected [0, 2] value because
0xffffffffULL + 0xffffffff + 0xffffffff is 0x2fffffffd,
but just [0, 1] whether there was any overflow at all.

It is something used in the wild and shorter to write than the
corresponding
#define __builtin_addc(a,b,carry_in,carry_out) \
  ({ unsigned _s; \
     unsigned _c1 = __builtin_uadd_overflow (a, b, &_s); \
     unsigned _c2 = __builtin_uadd_overflow (_s, carry_in, &_s); \
     *(carry_out) = (_c1 | _c2); \
     _s; })
and so a canned builtin for something people could often use.
It isn't that hard to maintain on the GCC side, as we just lower
it to two .ADD_OVERFLOW calls early, and the already committed
pottern recognization code can then make .UADDC/.USUBC calls out of
that if the carry in is in [0, 1] range and the corresponding
optab is supported by the target.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2023-06-16  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/79173
	* builtin-types.def (BT_FN_UINT_UINT_UINT_UINT_UINTPTR,
	BT_FN_ULONG_ULONG_ULONG_ULONG_ULONGPTR,
	BT_FN_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONGPTR): New
	types.
	* builtins.def (BUILT_IN_ADDC, BUILT_IN_ADDCL, BUILT_IN_ADDCLL,
	BUILT_IN_SUBC, BUILT_IN_SUBCL, BUILT_IN_SUBCLL): New builtins.
	* builtins.cc (fold_builtin_addc_subc): New function.
	(fold_builtin_varargs): Handle BUILT_IN_{ADD,SUB}C{,L,LL}.
	* doc/extend.texi (__builtin_addc, __builtin_subc): Document.

	* gcc.target/i386/pr79173-11.c: New test.
	* gcc.dg/builtin-addc-1.c: New test.


	Jakub
  

> Am 16.06.2023 um 16:34 schrieb Jakub Jelinek <jakub@redhat.com>:
> 
> Hi!
> 
> While the design of these builtins in clang is questionable,
> rather than being say
> unsigned __builtin_addc (unsigned, unsigned, bool, bool *)
> so that it is clear they add two [0, 0xffffffff] range numbers
> plus one [0, 1] range carry in and give [0, 0xffffffff] range
> return plus [0, 1] range carry out, they actually instead
> add 3 [0, 0xffffffff] values together but the carry out
> isn't then the expected [0, 2] value because
> 0xffffffffULL + 0xffffffff + 0xffffffff is 0x2fffffffd,
> but just [0, 1] whether there was any overflow at all.
> 
> It is something used in the wild and shorter to write than the
> corresponding
> #define __builtin_addc(a,b,carry_in,carry_out) \
>  ({ unsigned _s; \
>     unsigned _c1 = __builtin_uadd_overflow (a, b, &_s); \
>     unsigned _c2 = __builtin_uadd_overflow (_s, carry_in, &_s); \
>     *(carry_out) = (_c1 | _c2); \
>     _s; })
> and so a canned builtin for something people could often use.
> It isn't that hard to maintain on the GCC side, as we just lower
> it to two .ADD_OVERFLOW calls early, and the already committed
> pottern recognization code can then make .UADDC/.USUBC calls out of
> that if the carry in is in [0, 1] range and the corresponding
> optab is supported by the target.
> 
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

Ok

Richard 

> 2023-06-16  Jakub Jelinek  <jakub@redhat.com>
> 
>    PR middle-end/79173
>    * builtin-types.def (BT_FN_UINT_UINT_UINT_UINT_UINTPTR,
>    BT_FN_ULONG_ULONG_ULONG_ULONG_ULONGPTR,
>    BT_FN_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONGPTR): New
>    types.
>    * builtins.def (BUILT_IN_ADDC, BUILT_IN_ADDCL, BUILT_IN_ADDCLL,
>    BUILT_IN_SUBC, BUILT_IN_SUBCL, BUILT_IN_SUBCLL): New builtins.
>    * builtins.cc (fold_builtin_addc_subc): New function.
>    (fold_builtin_varargs): Handle BUILT_IN_{ADD,SUB}C{,L,LL}.
>    * doc/extend.texi (__builtin_addc, __builtin_subc): Document.
> 
>    * gcc.target/i386/pr79173-11.c: New test.
>    * gcc.dg/builtin-addc-1.c: New test.
> 
> --- gcc/builtin-types.def.jj    2023-06-16 12:01:09.622759288 +0200
> +++ gcc/builtin-types.def    2023-06-16 12:04:20.277086893 +0200
> @@ -842,10 +842,17 @@ DEF_FUNCTION_TYPE_4 (BT_FN_PTR_PTR_INT_S
>             BT_PTR, BT_PTR, BT_INT, BT_SIZE, BT_SIZE)
> DEF_FUNCTION_TYPE_4 (BT_FN_UINT_UINT_UINT_UINT_UINT,
>             BT_UINT, BT_UINT, BT_UINT, BT_UINT, BT_UINT)
> +DEF_FUNCTION_TYPE_4 (BT_FN_UINT_UINT_UINT_UINT_UINTPTR,
> +             BT_UINT, BT_UINT, BT_UINT, BT_UINT, BT_PTR_UINT)
> DEF_FUNCTION_TYPE_4 (BT_FN_UINT_FLOAT_FLOAT_FLOAT_FLOAT,
>             BT_UINT, BT_FLOAT, BT_FLOAT, BT_FLOAT, BT_FLOAT)
> DEF_FUNCTION_TYPE_4 (BT_FN_ULONG_ULONG_ULONG_UINT_UINT,
>             BT_ULONG, BT_ULONG, BT_ULONG, BT_UINT, BT_UINT)
> +DEF_FUNCTION_TYPE_4 (BT_FN_ULONG_ULONG_ULONG_ULONG_ULONGPTR,
> +             BT_ULONG, BT_ULONG, BT_ULONG, BT_ULONG, BT_PTR_ULONG)
> +DEF_FUNCTION_TYPE_4 (BT_FN_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONGPTR,
> +             BT_ULONGLONG, BT_ULONGLONG, BT_ULONGLONG, BT_ULONGLONG,
> +             BT_PTR_ULONGLONG)
> DEF_FUNCTION_TYPE_4 (BT_FN_STRING_STRING_CONST_STRING_SIZE_SIZE,
>             BT_STRING, BT_STRING, BT_CONST_STRING, BT_SIZE, BT_SIZE)
> DEF_FUNCTION_TYPE_4 (BT_FN_INT_FILEPTR_INT_CONST_STRING_VALIST_ARG,
> --- gcc/builtins.def.jj    2023-06-16 12:01:09.622759288 +0200
> +++ gcc/builtins.def    2023-06-16 12:04:20.278086879 +0200
> @@ -934,6 +934,12 @@ DEF_GCC_BUILTIN        (BUILT_IN_USUBLL_
> DEF_GCC_BUILTIN        (BUILT_IN_UMUL_OVERFLOW, "umul_overflow", BT_FN_BOOL_UINT_UINT_UINTPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
> DEF_GCC_BUILTIN        (BUILT_IN_UMULL_OVERFLOW, "umull_overflow", BT_FN_BOOL_ULONG_ULONG_ULONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
> DEF_GCC_BUILTIN        (BUILT_IN_UMULLL_OVERFLOW, "umulll_overflow", BT_FN_BOOL_ULONGLONG_ULONGLONG_ULONGLONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
> +DEF_GCC_BUILTIN        (BUILT_IN_ADDC, "addc", BT_FN_UINT_UINT_UINT_UINT_UINTPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
> +DEF_GCC_BUILTIN        (BUILT_IN_ADDCL, "addcl", BT_FN_ULONG_ULONG_ULONG_ULONG_ULONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
> +DEF_GCC_BUILTIN        (BUILT_IN_ADDCLL, "addcll", BT_FN_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
> +DEF_GCC_BUILTIN        (BUILT_IN_SUBC, "subc", BT_FN_UINT_UINT_UINT_UINT_UINTPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
> +DEF_GCC_BUILTIN        (BUILT_IN_SUBCL, "subcl", BT_FN_ULONG_ULONG_ULONG_ULONG_ULONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
> +DEF_GCC_BUILTIN        (BUILT_IN_SUBCLL, "subcll", BT_FN_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
> 
> /* Category: miscellaneous builtins.  */
> DEF_LIB_BUILTIN        (BUILT_IN_ABORT, "abort", BT_FN_VOID, ATTR_TMPURE_NORETURN_NOTHROW_LEAF_COLD_LIST)
> --- gcc/builtins.cc.jj    2023-06-13 18:23:37.141794072 +0200
> +++ gcc/builtins.cc    2023-06-16 13:11:25.094406298 +0200
> @@ -9555,6 +9555,51 @@ fold_builtin_arith_overflow (location_t
>   return build2_loc (loc, COMPOUND_EXPR, boolean_type_node, store, ovfres);
> }
> 
> +/* Fold __builtin_{add,sub}c{,l,ll} into pair of internal functions
> +   that return both result of arithmetics and overflowed boolean
> +   flag in a complex integer result.  */
> +
> +static tree
> +fold_builtin_addc_subc (location_t loc, enum built_in_function fcode,
> +            tree *args)
> +{
> +  enum internal_fn ifn;
> +
> +  switch (fcode)
> +    {
> +    case BUILT_IN_ADDC:
> +    case BUILT_IN_ADDCL:
> +    case BUILT_IN_ADDCLL:
> +      ifn = IFN_ADD_OVERFLOW;
> +      break;
> +    case BUILT_IN_SUBC:
> +    case BUILT_IN_SUBCL:
> +    case BUILT_IN_SUBCLL:
> +      ifn = IFN_SUB_OVERFLOW;
> +      break;
> +    default:
> +      gcc_unreachable ();
> +    }
> +
> +  tree type = TREE_TYPE (args[0]);
> +  tree ctype = build_complex_type (type);
> +  tree call = build_call_expr_internal_loc (loc, ifn, ctype, 2,
> +                        args[0], args[1]);
> +  tree tgt = save_expr (call);
> +  tree intres = build1_loc (loc, REALPART_EXPR, type, tgt);
> +  tree ovfres = build1_loc (loc, IMAGPART_EXPR, type, tgt);
> +  call = build_call_expr_internal_loc (loc, ifn, ctype, 2,
> +                       intres, args[2]);
> +  tgt = save_expr (call);
> +  intres = build1_loc (loc, REALPART_EXPR, type, tgt);
> +  tree ovfres2 = build1_loc (loc, IMAGPART_EXPR, type, tgt);
> +  ovfres = build2_loc (loc, BIT_IOR_EXPR, type, ovfres, ovfres2);
> +  tree mem_arg3 = build_fold_indirect_ref_loc (loc, args[3]);
> +  tree store
> +    = fold_build2_loc (loc, MODIFY_EXPR, void_type_node, mem_arg3, ovfres);
> +  return build2_loc (loc, COMPOUND_EXPR, type, store, intres);
> +}
> +
> /* Fold a call to __builtin_FILE to a constant string.  */
> 
> static inline tree
> @@ -10843,6 +10888,14 @@ fold_builtin_varargs (location_t loc, tr
>       ret = fold_builtin_fpclassify (loc, args, nargs);
>       break;
> 
> +    case BUILT_IN_ADDC:
> +    case BUILT_IN_ADDCL:
> +    case BUILT_IN_ADDCLL:
> +    case BUILT_IN_SUBC:
> +    case BUILT_IN_SUBCL:
> +    case BUILT_IN_SUBCLL:
> +      return fold_builtin_addc_subc (loc, fcode, args);
> +
>     default:
>       break;
>     }
> --- gcc/doc/extend.texi.jj    2023-06-16 12:01:15.015683954 +0200
> +++ gcc/doc/extend.texi    2023-06-16 12:40:10.179841300 +0200
> @@ -12839,6 +12839,50 @@ after addition, conditional jump on carr
> 
> @enddefbuiltin
> 
> +@defbuiltin{unsigned int __builtin_addc (unsigned int a, unsigned int b, unsigned int carry_in, unsigned int *carry_out)}
> +@defbuiltinx{unsigned long int __builtin_addcl (unsigned long int a, unsigned long int b, unsigned int carry_in, unsigned long int *carry_out)}
> +@defbuiltinx{unsigned long long int __builtin_addcll (unsigned long long int a, unsigned long long int b, unsigned long long int carry_in, unsigned long long int *carry_out)}
> +
> +These built-in functions are equivalent to:
> +@smallexample
> +  (@{ __typeof__ (@var{a}) s; \
> +      __typeof__ (@var{a}) c1 = __builtin_add_overflow (@var{a}, @var{b}, &s); \
> +      __typeof__ (@var{a}) c2 = __builtin_add_overflow (s, @var{carry_in}, &s); \
> +      *(@var{carry_out}) = c1 | c2; \
> +      s; @})
> +@end smallexample
> +
> +i.e.@: they add 3 unsigned values, set what the last argument
> +points to to 1 if any of the two additions overflowed (otherwise 0)
> +and return the sum of those 3 unsigned values.  Note, while all
> +the first 3 arguments can have arbitrary values, better code will be
> +emitted if one of them (preferrably the third one) has only values
> +0 or 1 (i.e.@: carry-in).
> +
> +@enddefbuiltin
> +
> +@defbuiltin{unsigned int __builtin_subc (unsigned int a, unsigned int b, unsigned int carry_in, unsigned int *carry_out)}
> +@defbuiltinx{unsigned long int __builtin_subcl (unsigned long int a, unsigned long int b, unsigned int carry_in, unsigned long int *carry_out)}
> +@defbuiltinx{unsigned long long int __builtin_subcll (unsigned long long int a, unsigned long long int b, unsigned long long int carry_in, unsigned long long int *carry_out)}
> +
> +These built-in functions are equivalent to:
> +@smallexample
> +  (@{ __typeof__ (@var{a}) s; \
> +      __typeof__ (@var{a}) c1 = __builtin_sub_overflow (@var{a}, @var{b}, &s); \
> +      __typeof__ (@var{a}) c2 = __builtin_sub_overflow (s, @var{carry_in}, &s); \
> +      *(@var{carry_out}) = c1 | c2; \
> +      s; @})
> +@end smallexample
> +
> +i.e.@: they subtract 2 unsigned values from the first unsigned value,
> +set what the last argument points to to 1 if any of the two subtractions
> +overflowed (otherwise 0) and return the result of the subtractions.
> +Note, while all the first 3 arguments can have arbitrary values, better code
> +will be emitted if one of them (preferrably the third one) has only values
> +0 or 1 (i.e.@: carry-in).
> +
> +@enddefbuiltin
> +
> @node x86 specific memory model extensions for transactional memory
> @section x86-Specific Memory Model Extensions for Transactional Memory
> 
> --- gcc/testsuite/gcc.target/i386/pr79173-11.c.jj    2023-06-16 12:46:12.659735680 +0200
> +++ gcc/testsuite/gcc.target/i386/pr79173-11.c    2023-06-16 12:46:41.864323951 +0200
> @@ -0,0 +1,39 @@
> +/* PR middle-end/79173 */
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -fno-stack-protector -masm=att" } */
> +/* { dg-final { scan-assembler-times "addq\t%r\[^\n\r]*, \\\(%rdi\\\)" 1 { target lp64 } } } */
> +/* { dg-final { scan-assembler-times "adcq\t%r\[^\n\r]*, 8\\\(%rdi\\\)" 1 { target lp64 } } } */
> +/* { dg-final { scan-assembler-times "adcq\t%r\[^\n\r]*, 16\\\(%rdi\\\)" 1 { target lp64 } } } */
> +/* { dg-final { scan-assembler-times "adcq\t%r\[^\n\r]*, 24\\\(%rdi\\\)" 1 { target lp64 } } } */
> +/* { dg-final { scan-assembler-times "subq\t%r\[^\n\r]*, \\\(%rdi\\\)" 1 { target lp64 } } } */
> +/* { dg-final { scan-assembler-times "sbbq\t%r\[^\n\r]*, 8\\\(%rdi\\\)" 1 { target lp64 } } } */
> +/* { dg-final { scan-assembler-times "sbbq\t%r\[^\n\r]*, 16\\\(%rdi\\\)" 1 { target lp64 } } } */
> +/* { dg-final { scan-assembler-times "sbbq\t%r\[^\n\r]*, 24\\\(%rdi\\\)" 1 { target lp64 } } } */
> +/* { dg-final { scan-assembler-times "addl\t%e\[^\n\r]*, \\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
> +/* { dg-final { scan-assembler-times "adcl\t%e\[^\n\r]*, 4\\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
> +/* { dg-final { scan-assembler-times "adcl\t%e\[^\n\r]*, 8\\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
> +/* { dg-final { scan-assembler-times "adcl\t%e\[^\n\r]*, 12\\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
> +/* { dg-final { scan-assembler-times "subl\t%e\[^\n\r]*, \\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
> +/* { dg-final { scan-assembler-times "sbbl\t%e\[^\n\r]*, 4\\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
> +/* { dg-final { scan-assembler-times "sbbl\t%e\[^\n\r]*, 8\\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
> +/* { dg-final { scan-assembler-times "sbbl\t%e\[^\n\r]*, 12\\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
> +
> +void
> +foo (unsigned long *p, unsigned long *q)
> +{
> +  unsigned long c;
> +  p[0] = __builtin_addcl (p[0], q[0], 0, &c);
> +  p[1] = __builtin_addcl (p[1], q[1], c, &c);
> +  p[2] = __builtin_addcl (p[2], q[2], c, &c);
> +  p[3] = __builtin_addcl (p[3], q[3], c, &c);
> +}
> +
> +void
> +bar (unsigned long *p, unsigned long *q)
> +{
> +  unsigned long c;
> +  p[0] = __builtin_subcl (p[0], q[0], 0, &c);
> +  p[1] = __builtin_subcl (p[1], q[1], c, &c);
> +  p[2] = __builtin_subcl (p[2], q[2], c, &c);
> +  p[3] = __builtin_subcl (p[3], q[3], c, &c);
> +}
> --- gcc/testsuite/gcc.dg/builtin-addc-1.c.jj    2023-06-16 12:47:57.247261195 +0200
> +++ gcc/testsuite/gcc.dg/builtin-addc-1.c    2023-06-16 13:03:19.269260147 +0200
> @@ -0,0 +1,101 @@
> +/* { dg-do run } */
> +/* { dg-options "-O2 -g" } */
> +
> +int
> +main ()
> +{
> +  unsigned int c;
> +  unsigned long cl;
> +  unsigned long long cll;
> +  if (__builtin_addc (1, 42, 0, &c) != 43 || c != 0)
> +    __builtin_abort ();
> +  if (__builtin_addc (1, 42, 15, &c) != 58 || c != 0)
> +    __builtin_abort ();
> +  if (__builtin_addc (-2U, -3U, -4U, &c) != -9U || c != 1)
> +    __builtin_abort ();
> +  if (__builtin_addc (-2U, 1, 0, &c) != -1U || c != 0)
> +    __builtin_abort ();
> +  if (__builtin_addc (-2U, 1, 1, &c) != 0 || c != 1)
> +    __builtin_abort ();
> +  if (__builtin_addc (-2U, 2, 0, &c) != 0 || c != 1)
> +    __builtin_abort ();
> +  if (__builtin_addc (-2U, 0, 2, &c) != 0 || c != 1)
> +    __builtin_abort ();
> +  if (__builtin_addcl (1L, 42L, 0L, &cl) != 43 || cl != 0L)
> +    __builtin_abort ();
> +  if (__builtin_addcl (1L, 42L, 15L, &cl) != 58 || cl != 0L)
> +    __builtin_abort ();
> +  if (__builtin_addcl (-2UL, -3UL, -4UL, &cl) != -9UL || cl != 1L)
> +    __builtin_abort ();
> +  if (__builtin_addcl (-2UL, 1L, 0L, &cl) != -1UL || cl != 0L)
> +    __builtin_abort ();
> +  if (__builtin_addcl (-2UL, 1L, 1L, &cl) != 0 || cl != 1L)
> +    __builtin_abort ();
> +  if (__builtin_addcl (-2UL, 2L, 0L, &cl) != 0 || cl != 1L)
> +    __builtin_abort ();
> +  if (__builtin_addcl (-2UL, 0L, 2L, &cl) != 0 || cl != 1L)
> +    __builtin_abort ();
> +  if (__builtin_addcll (1LL, 42LL, 0LL, &cll) != 43 || cll != 0LL)
> +    __builtin_abort ();
> +  if (__builtin_addcll (1LL, 42LL, 15LL, &cll) != 58 || cll != 0LL)
> +    __builtin_abort ();
> +  if (__builtin_addcll (-2ULL, -3ULL, -4ULL, &cll) != -9ULL || cll != 1LL)
> +    __builtin_abort ();
> +  if (__builtin_addcll (-2ULL, 1LL, 0LL, &cll) != -1ULL || cll != 0LL)
> +    __builtin_abort ();
> +  if (__builtin_addcll (-2ULL, 1LL, 1LL, &cll) != 0 || cll != 1LL)
> +    __builtin_abort ();
> +  if (__builtin_addcll (-2ULL, 2LL, 0LL, &cll) != 0 || cll != 1LL)
> +    __builtin_abort ();
> +  if (__builtin_addcll (-2ULL, 0LL, 2LL, &cll) != 0 || cll != 1LL)
> +    __builtin_abort ();
> +  if (__builtin_subc (42, 42, 0, &c) != 0 || c != 0)
> +    __builtin_abort ();
> +  if (__builtin_subc (42, 42, 1, &c) != -1U || c != 1)
> +    __builtin_abort ();
> +  if (__builtin_subc (1, -3U, -4U, &c) != 8 || c != 1)
> +    __builtin_abort ();
> +  if (__builtin_subc (-2U, 1, 0, &c) != -3U || c != 0)
> +    __builtin_abort ();
> +  if (__builtin_subc (-2U, -1U, 0, &c) != -1U || c != 1)
> +    __builtin_abort ();
> +  if (__builtin_subc (-2U, -2U, 0, &c) != 0 || c != 0)
> +    __builtin_abort ();
> +  if (__builtin_subc (-2U, -2U, 1, &c) != -1U || c != 1)
> +    __builtin_abort ();
> +  if (__builtin_subc (-2U, 1, -2U, &c) != -1U || c != 1)
> +    __builtin_abort ();
> +  if (__builtin_subcl (42L, 42L, 0L, &cl) != 0L || cl != 0L)
> +    __builtin_abort ();
> +  if (__builtin_subcl (42L, 42L, 1L, &cl) != -1UL || cl != 1L)
> +    __builtin_abort ();
> +  if (__builtin_subcl (1L, -3UL, -4UL, &cl) != 8L || cl != 1L)
> +    __builtin_abort ();
> +  if (__builtin_subcl (-2UL, 1L, 0L, &cl) != -3UL || cl != 0L)
> +    __builtin_abort ();
> +  if (__builtin_subcl (-2UL, -1UL, 0L, &cl) != -1UL || cl != 1L)
> +    __builtin_abort ();
> +  if (__builtin_subcl (-2UL, -2UL, 0L, &cl) != 0L || cl != 0L)
> +    __builtin_abort ();
> +  if (__builtin_subcl (-2UL, -2UL, 1L, &cl) != -1UL || cl != 1L)
> +    __builtin_abort ();
> +  if (__builtin_subcl (-2UL, 1L, -2UL, &cl) != -1UL || cl != 1L)
> +    __builtin_abort ();
> +  if (__builtin_subcll (42LL, 42LL, 0LL, &cll) != 0LL || cll != 0LL)
> +    __builtin_abort ();
> +  if (__builtin_subcll (42LL, 42LL, 1LL, &cll) != -1ULL || cll != 1LL)
> +    __builtin_abort ();
> +  if (__builtin_subcll (1LL, -3ULL, -4ULL, &cll) != 8LL || cll != 1LL)
> +    __builtin_abort ();
> +  if (__builtin_subcll (-2ULL, 1LL, 0LL, &cll) != -3ULL || cll != 0LL)
> +    __builtin_abort ();
> +  if (__builtin_subcll (-2ULL, -1ULL, 0LL, &cll) != -1ULL || cll != 1LL)
> +    __builtin_abort ();
> +  if (__builtin_subcll (-2ULL, -2ULL, 0LL, &cll) != 0LL || cll != 0LL)
> +    __builtin_abort ();
> +  if (__builtin_subcll (-2ULL, -2ULL, 1LL, &cll) != -1ULL || cll != 1LL)
> +    __builtin_abort ();
> +  if (__builtin_subcll (-2ULL, 1LL, -2ULL, &cll) != -1ULL || cll != 1LL)
> +    __builtin_abort ();
> +  return 0;
> +}
> 
>    Jakub
>