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c: Fix up __builtin_assoc_barrier handling in the C FE [PR104427] 

The following testcase ICEs, because when creating PAREN_EXPR for
__builtin_assoc_barrier the FE doesn't do the usual tweaks for
EXCESS_PRECISION_EXPR or C_MAYBE_CONST_EXPR.  I believe that the
declared effect of the builtin is just association barrier, so
e.g. excess precision should be still handled like if it wasn't
there.

The following patch uses build_unary_op to handle those.

2022-02-09  Jakub Jelinek  <jakub@redhat.com>

	PR c/104427
	* c-parser.cc (c_parser_postfix_expression)
	<case RID_BUILTIN_ASSOC_BARRIER>: Use parser_build_unary_op
	instead of build1_loc to build PAREN_EXPR.
	* c-typeck.cc (build_unary_op): Handle PAREN_EXPR.
	* c-fold.cc (c_fully_fold_internal): Likewise.

	* gcc.dg/pr104427.c: New test.
This commit is contained in:
Jakub Jelinek 2022-02-09 20:45:31 +01:00
parent 2f9ab267e7
commit 499f8d4c2b
4 changed files with 19 additions and 2 deletions
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1
gcc/c/c-fold.cc
View File

@ -465,6 +465,7 @@ c_fully_fold_internal (tree expr, bool in_init, bool *maybe_const_operands,
case BIT_NOT_EXPR:
case TRUTH_NOT_EXPR:
case CONJ_EXPR:
case PAREN_EXPR:
unary:
/* Unary operations. */
orig_op0 = op0 = TREE_OPERAND (expr, 0);

3
gcc/c/c-parser.cc
View File

@ -10128,8 +10128,7 @@ c_parser_postfix_expression (c_parser *parser)
mark_exp_read (e1.value);
location_t end_loc = c_parser_peek_token (parser)->get_finish ();
parens.skip_until_found_close (parser);
expr.value = build1_loc (loc, PAREN_EXPR, TREE_TYPE (e1.value),
e1.value);
expr = parser_build_unary_op (loc, PAREN_EXPR, e1);
set_c_expr_source_range (&expr, start_loc, end_loc);
}
break;

4
gcc/c/c-typeck.cc
View File

@ -4921,6 +4921,10 @@ build_unary_op (location_t location, enum tree_code code, tree xarg,
ret = val;
goto return_build_unary_op;
case PAREN_EXPR:
ret = build1 (code, TREE_TYPE (arg), arg);
goto return_build_unary_op;
default:
gcc_unreachable ();
}

13
gcc/testsuite/gcc.dg/pr104427.c Normal file
View File

@ -0,0 +1,13 @@
/* PR c/104427 */
/* { dg-do compile } */
/* { dg-options "" } */
/* { dg-add-options float16 } */
/* { dg-require-effective-target float16 } */
_Float16 x, y;
int
foo ()
{
return __builtin_assoc_barrier (x + y) - y;
}