uiltins: Add support for clang compatible __builtin_{add,sub}c{,l,ll} [PR79173]
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.
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.
This commit is contained in:
Jakub Jelinek
parent
5b67116a85
commit
2b4e0415ad
6 changed files with 250 additions and 0 deletions
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@ -842,10 +842,17 @@ DEF_FUNCTION_TYPE_4 (BT_FN_PTR_PTR_INT_SIZE_SIZE,
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BT_PTR, BT_PTR, BT_INT, BT_SIZE, BT_SIZE)
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DEF_FUNCTION_TYPE_4 (BT_FN_UINT_UINT_UINT_UINT_UINT,
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BT_UINT, BT_UINT, BT_UINT, BT_UINT, BT_UINT)
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DEF_FUNCTION_TYPE_4 (BT_FN_UINT_UINT_UINT_UINT_UINTPTR,
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BT_UINT, BT_UINT, BT_UINT, BT_UINT, BT_PTR_UINT)
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DEF_FUNCTION_TYPE_4 (BT_FN_UINT_FLOAT_FLOAT_FLOAT_FLOAT,
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BT_UINT, BT_FLOAT, BT_FLOAT, BT_FLOAT, BT_FLOAT)
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DEF_FUNCTION_TYPE_4 (BT_FN_ULONG_ULONG_ULONG_UINT_UINT,
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BT_ULONG, BT_ULONG, BT_ULONG, BT_UINT, BT_UINT)
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DEF_FUNCTION_TYPE_4 (BT_FN_ULONG_ULONG_ULONG_ULONG_ULONGPTR,
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BT_ULONG, BT_ULONG, BT_ULONG, BT_ULONG, BT_PTR_ULONG)
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DEF_FUNCTION_TYPE_4 (BT_FN_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONGPTR,
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BT_ULONGLONG, BT_ULONGLONG, BT_ULONGLONG, BT_ULONGLONG,
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BT_PTR_ULONGLONG)
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DEF_FUNCTION_TYPE_4 (BT_FN_STRING_STRING_CONST_STRING_SIZE_SIZE,
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BT_STRING, BT_STRING, BT_CONST_STRING, BT_SIZE, BT_SIZE)
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DEF_FUNCTION_TYPE_4 (BT_FN_INT_FILEPTR_INT_CONST_STRING_VALIST_ARG,
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@ -9555,6 +9555,51 @@ fold_builtin_arith_overflow (location_t loc, enum built_in_function fcode,
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return build2_loc (loc, COMPOUND_EXPR, boolean_type_node, store, ovfres);
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}
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/* Fold __builtin_{add,sub}c{,l,ll} into pair of internal functions
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that return both result of arithmetics and overflowed boolean
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flag in a complex integer result. */
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static tree
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fold_builtin_addc_subc (location_t loc, enum built_in_function fcode,
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tree *args)
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{
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enum internal_fn ifn;
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switch (fcode)
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{
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case BUILT_IN_ADDC:
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case BUILT_IN_ADDCL:
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case BUILT_IN_ADDCLL:
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ifn = IFN_ADD_OVERFLOW;
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break;
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case BUILT_IN_SUBC:
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case BUILT_IN_SUBCL:
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case BUILT_IN_SUBCLL:
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ifn = IFN_SUB_OVERFLOW;
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break;
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default:
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gcc_unreachable ();
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}
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tree type = TREE_TYPE (args[0]);
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tree ctype = build_complex_type (type);
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tree call = build_call_expr_internal_loc (loc, ifn, ctype, 2,
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args[0], args[1]);
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tree tgt = save_expr (call);
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tree intres = build1_loc (loc, REALPART_EXPR, type, tgt);
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tree ovfres = build1_loc (loc, IMAGPART_EXPR, type, tgt);
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call = build_call_expr_internal_loc (loc, ifn, ctype, 2,
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intres, args[2]);
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tgt = save_expr (call);
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intres = build1_loc (loc, REALPART_EXPR, type, tgt);
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tree ovfres2 = build1_loc (loc, IMAGPART_EXPR, type, tgt);
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ovfres = build2_loc (loc, BIT_IOR_EXPR, type, ovfres, ovfres2);
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tree mem_arg3 = build_fold_indirect_ref_loc (loc, args[3]);
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tree store
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= fold_build2_loc (loc, MODIFY_EXPR, void_type_node, mem_arg3, ovfres);
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return build2_loc (loc, COMPOUND_EXPR, type, store, intres);
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}
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/* Fold a call to __builtin_FILE to a constant string. */
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static inline tree
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@ -10843,6 +10888,14 @@ fold_builtin_varargs (location_t loc, tree fndecl, tree *args, int nargs)
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ret = fold_builtin_fpclassify (loc, args, nargs);
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break;
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case BUILT_IN_ADDC:
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case BUILT_IN_ADDCL:
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case BUILT_IN_ADDCLL:
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case BUILT_IN_SUBC:
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case BUILT_IN_SUBCL:
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case BUILT_IN_SUBCLL:
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return fold_builtin_addc_subc (loc, fcode, args);
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default:
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break;
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}
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@ -934,6 +934,12 @@ DEF_GCC_BUILTIN (BUILT_IN_USUBLL_OVERFLOW, "usubll_overflow", BT_FN_BOOL_
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DEF_GCC_BUILTIN (BUILT_IN_UMUL_OVERFLOW, "umul_overflow", BT_FN_BOOL_UINT_UINT_UINTPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
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DEF_GCC_BUILTIN (BUILT_IN_UMULL_OVERFLOW, "umull_overflow", BT_FN_BOOL_ULONG_ULONG_ULONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
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DEF_GCC_BUILTIN (BUILT_IN_UMULLL_OVERFLOW, "umulll_overflow", BT_FN_BOOL_ULONGLONG_ULONGLONG_ULONGLONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
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DEF_GCC_BUILTIN (BUILT_IN_ADDC, "addc", BT_FN_UINT_UINT_UINT_UINT_UINTPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
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DEF_GCC_BUILTIN (BUILT_IN_ADDCL, "addcl", BT_FN_ULONG_ULONG_ULONG_ULONG_ULONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
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DEF_GCC_BUILTIN (BUILT_IN_ADDCLL, "addcll", BT_FN_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
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DEF_GCC_BUILTIN (BUILT_IN_SUBC, "subc", BT_FN_UINT_UINT_UINT_UINT_UINTPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
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DEF_GCC_BUILTIN (BUILT_IN_SUBCL, "subcl", BT_FN_ULONG_ULONG_ULONG_ULONG_ULONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
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DEF_GCC_BUILTIN (BUILT_IN_SUBCLL, "subcll", BT_FN_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONG_ULONGLONGPTR, ATTR_NOTHROW_NONNULL_LEAF_LIST)
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/* Category: miscellaneous builtins. */
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DEF_LIB_BUILTIN (BUILT_IN_ABORT, "abort", BT_FN_VOID, ATTR_TMPURE_NORETURN_NOTHROW_LEAF_COLD_LIST)
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@ -12839,6 +12839,50 @@ after addition, conditional jump on carry etc.
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@enddefbuiltin
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@defbuiltin{unsigned int __builtin_addc (unsigned int a, unsigned int b, unsigned int carry_in, unsigned int *carry_out)}
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@defbuiltinx{unsigned long int __builtin_addcl (unsigned long int a, unsigned long int b, unsigned int carry_in, unsigned long int *carry_out)}
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@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)}
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These built-in functions are equivalent to:
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@smallexample
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(@{ __typeof__ (@var{a}) s; \
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__typeof__ (@var{a}) c1 = __builtin_add_overflow (@var{a}, @var{b}, &s); \
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__typeof__ (@var{a}) c2 = __builtin_add_overflow (s, @var{carry_in}, &s); \
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*(@var{carry_out}) = c1 | c2; \
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s; @})
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@end smallexample
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i.e.@: they add 3 unsigned values, set what the last argument
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points to to 1 if any of the two additions overflowed (otherwise 0)
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and return the sum of those 3 unsigned values. Note, while all
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the first 3 arguments can have arbitrary values, better code will be
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emitted if one of them (preferrably the third one) has only values
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0 or 1 (i.e.@: carry-in).
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@enddefbuiltin
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@defbuiltin{unsigned int __builtin_subc (unsigned int a, unsigned int b, unsigned int carry_in, unsigned int *carry_out)}
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@defbuiltinx{unsigned long int __builtin_subcl (unsigned long int a, unsigned long int b, unsigned int carry_in, unsigned long int *carry_out)}
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@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)}
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These built-in functions are equivalent to:
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@smallexample
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(@{ __typeof__ (@var{a}) s; \
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__typeof__ (@var{a}) c1 = __builtin_sub_overflow (@var{a}, @var{b}, &s); \
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__typeof__ (@var{a}) c2 = __builtin_sub_overflow (s, @var{carry_in}, &s); \
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*(@var{carry_out}) = c1 | c2; \
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s; @})
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@end smallexample
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i.e.@: they subtract 2 unsigned values from the first unsigned value,
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set what the last argument points to to 1 if any of the two subtractions
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overflowed (otherwise 0) and return the result of the subtractions.
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Note, while all the first 3 arguments can have arbitrary values, better code
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will be emitted if one of them (preferrably the third one) has only values
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0 or 1 (i.e.@: carry-in).
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@enddefbuiltin
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@node x86 specific memory model extensions for transactional memory
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@section x86-Specific Memory Model Extensions for Transactional Memory
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101
gcc/testsuite/gcc.dg/builtin-addc-1.c
Normal file
101
gcc/testsuite/gcc.dg/builtin-addc-1.c
Normal file
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@ -0,0 +1,101 @@
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/* { dg-do run } */
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/* { dg-options "-O2 -g" } */
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int
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main ()
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{
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unsigned int c;
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unsigned long cl;
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unsigned long long cll;
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if (__builtin_addc (1, 42, 0, &c) != 43 || c != 0)
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__builtin_abort ();
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if (__builtin_addc (1, 42, 15, &c) != 58 || c != 0)
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__builtin_abort ();
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if (__builtin_addc (-2U, -3U, -4U, &c) != -9U || c != 1)
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__builtin_abort ();
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if (__builtin_addc (-2U, 1, 0, &c) != -1U || c != 0)
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__builtin_abort ();
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if (__builtin_addc (-2U, 1, 1, &c) != 0 || c != 1)
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__builtin_abort ();
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if (__builtin_addc (-2U, 2, 0, &c) != 0 || c != 1)
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__builtin_abort ();
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if (__builtin_addc (-2U, 0, 2, &c) != 0 || c != 1)
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__builtin_abort ();
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if (__builtin_addcl (1L, 42L, 0L, &cl) != 43 || cl != 0L)
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__builtin_abort ();
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if (__builtin_addcl (1L, 42L, 15L, &cl) != 58 || cl != 0L)
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__builtin_abort ();
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if (__builtin_addcl (-2UL, -3UL, -4UL, &cl) != -9UL || cl != 1L)
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__builtin_abort ();
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if (__builtin_addcl (-2UL, 1L, 0L, &cl) != -1UL || cl != 0L)
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__builtin_abort ();
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if (__builtin_addcl (-2UL, 1L, 1L, &cl) != 0 || cl != 1L)
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__builtin_abort ();
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if (__builtin_addcl (-2UL, 2L, 0L, &cl) != 0 || cl != 1L)
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__builtin_abort ();
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if (__builtin_addcl (-2UL, 0L, 2L, &cl) != 0 || cl != 1L)
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__builtin_abort ();
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if (__builtin_addcll (1LL, 42LL, 0LL, &cll) != 43 || cll != 0LL)
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__builtin_abort ();
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if (__builtin_addcll (1LL, 42LL, 15LL, &cll) != 58 || cll != 0LL)
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__builtin_abort ();
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if (__builtin_addcll (-2ULL, -3ULL, -4ULL, &cll) != -9ULL || cll != 1LL)
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__builtin_abort ();
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if (__builtin_addcll (-2ULL, 1LL, 0LL, &cll) != -1ULL || cll != 0LL)
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__builtin_abort ();
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if (__builtin_addcll (-2ULL, 1LL, 1LL, &cll) != 0 || cll != 1LL)
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__builtin_abort ();
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if (__builtin_addcll (-2ULL, 2LL, 0LL, &cll) != 0 || cll != 1LL)
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__builtin_abort ();
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if (__builtin_addcll (-2ULL, 0LL, 2LL, &cll) != 0 || cll != 1LL)
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__builtin_abort ();
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if (__builtin_subc (42, 42, 0, &c) != 0 || c != 0)
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__builtin_abort ();
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if (__builtin_subc (42, 42, 1, &c) != -1U || c != 1)
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__builtin_abort ();
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if (__builtin_subc (1, -3U, -4U, &c) != 8 || c != 1)
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__builtin_abort ();
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if (__builtin_subc (-2U, 1, 0, &c) != -3U || c != 0)
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__builtin_abort ();
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if (__builtin_subc (-2U, -1U, 0, &c) != -1U || c != 1)
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__builtin_abort ();
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if (__builtin_subc (-2U, -2U, 0, &c) != 0 || c != 0)
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__builtin_abort ();
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if (__builtin_subc (-2U, -2U, 1, &c) != -1U || c != 1)
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__builtin_abort ();
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if (__builtin_subc (-2U, 1, -2U, &c) != -1U || c != 1)
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__builtin_abort ();
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if (__builtin_subcl (42L, 42L, 0L, &cl) != 0L || cl != 0L)
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__builtin_abort ();
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if (__builtin_subcl (42L, 42L, 1L, &cl) != -1UL || cl != 1L)
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__builtin_abort ();
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if (__builtin_subcl (1L, -3UL, -4UL, &cl) != 8L || cl != 1L)
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__builtin_abort ();
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if (__builtin_subcl (-2UL, 1L, 0L, &cl) != -3UL || cl != 0L)
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__builtin_abort ();
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if (__builtin_subcl (-2UL, -1UL, 0L, &cl) != -1UL || cl != 1L)
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__builtin_abort ();
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if (__builtin_subcl (-2UL, -2UL, 0L, &cl) != 0L || cl != 0L)
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__builtin_abort ();
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if (__builtin_subcl (-2UL, -2UL, 1L, &cl) != -1UL || cl != 1L)
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__builtin_abort ();
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if (__builtin_subcl (-2UL, 1L, -2UL, &cl) != -1UL || cl != 1L)
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__builtin_abort ();
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if (__builtin_subcll (42LL, 42LL, 0LL, &cll) != 0LL || cll != 0LL)
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__builtin_abort ();
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if (__builtin_subcll (42LL, 42LL, 1LL, &cll) != -1ULL || cll != 1LL)
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__builtin_abort ();
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if (__builtin_subcll (1LL, -3ULL, -4ULL, &cll) != 8LL || cll != 1LL)
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__builtin_abort ();
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if (__builtin_subcll (-2ULL, 1LL, 0LL, &cll) != -3ULL || cll != 0LL)
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__builtin_abort ();
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if (__builtin_subcll (-2ULL, -1ULL, 0LL, &cll) != -1ULL || cll != 1LL)
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__builtin_abort ();
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if (__builtin_subcll (-2ULL, -2ULL, 0LL, &cll) != 0LL || cll != 0LL)
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__builtin_abort ();
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if (__builtin_subcll (-2ULL, -2ULL, 1LL, &cll) != -1ULL || cll != 1LL)
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__builtin_abort ();
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if (__builtin_subcll (-2ULL, 1LL, -2ULL, &cll) != -1ULL || cll != 1LL)
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__builtin_abort ();
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return 0;
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}
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39
gcc/testsuite/gcc.target/i386/pr79173-11.c
Normal file
39
gcc/testsuite/gcc.target/i386/pr79173-11.c
Normal file
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@ -0,0 +1,39 @@
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/* PR middle-end/79173 */
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/* { dg-do compile } */
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/* { dg-options "-O2 -fno-stack-protector -masm=att" } */
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/* { dg-final { scan-assembler-times "addq\t%r\[^\n\r]*, \\\(%rdi\\\)" 1 { target lp64 } } } */
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/* { dg-final { scan-assembler-times "adcq\t%r\[^\n\r]*, 8\\\(%rdi\\\)" 1 { target lp64 } } } */
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/* { dg-final { scan-assembler-times "adcq\t%r\[^\n\r]*, 16\\\(%rdi\\\)" 1 { target lp64 } } } */
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/* { dg-final { scan-assembler-times "adcq\t%r\[^\n\r]*, 24\\\(%rdi\\\)" 1 { target lp64 } } } */
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/* { dg-final { scan-assembler-times "subq\t%r\[^\n\r]*, \\\(%rdi\\\)" 1 { target lp64 } } } */
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/* { dg-final { scan-assembler-times "sbbq\t%r\[^\n\r]*, 8\\\(%rdi\\\)" 1 { target lp64 } } } */
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/* { dg-final { scan-assembler-times "sbbq\t%r\[^\n\r]*, 16\\\(%rdi\\\)" 1 { target lp64 } } } */
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/* { dg-final { scan-assembler-times "sbbq\t%r\[^\n\r]*, 24\\\(%rdi\\\)" 1 { target lp64 } } } */
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/* { dg-final { scan-assembler-times "addl\t%e\[^\n\r]*, \\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
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/* { dg-final { scan-assembler-times "adcl\t%e\[^\n\r]*, 4\\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
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/* { dg-final { scan-assembler-times "adcl\t%e\[^\n\r]*, 8\\\(%e\[^\n\r]*\\\)" 1 { target ia32 } } } */
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/* { 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);
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue