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| author | Jakub Jelinek <jakub@redhat.com> | 2017-01-11 21:10:36 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2017-01-11 21:10:36 +0100 |
| commit | eae63d784c503ad7954ac8ae28232aec635ac7fc (patch) | |
| tree | 445f6cd62d154885a446d235163b694f1b08a014 /gcc/fold-const.c | |
| parent | 88df7964b5aa1b8cc2226177da25785c58b7c7e2 (diff) | |
| download | gcc-eae63d784c503ad7954ac8ae28232aec635ac7fc.zip gcc-eae63d784c503ad7954ac8ae28232aec635ac7fc.tar.gz gcc-eae63d784c503ad7954ac8ae28232aec635ac7fc.tar.bz2 | |
re PR c++/71537 (GCC rejects consetxpr boolean conversions and comparisons on the result of pointer arithmetic.)
PR c++/71537
* fold-const.c (maybe_nonzero_address): Return 1 for function
local objects.
(tree_single_nonzero_warnv_p): Don't handle function local objects
here.
* g++.dg/cpp1y/constexpr-71537.C: New test.
From-SVN: r244333
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 73ebd76..cfd270c 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -8171,7 +8171,8 @@ pointer_may_wrap_p (tree base, tree offset, HOST_WIDE_INT bitpos) /* Return a positive integer when the symbol DECL is known to have a nonzero address, zero when it's known not to (e.g., it's a weak symbol), and a negative integer when the symbol is not yet in the - symbol table and so whether or not its address is zero is unknown. */ + symbol table and so whether or not its address is zero is unknown. + For function local objects always return positive integer. */ static int maybe_nonzero_address (tree decl) { @@ -8179,6 +8180,13 @@ maybe_nonzero_address (tree decl) if (struct symtab_node *symbol = symtab_node::get_create (decl)) return symbol->nonzero_address (); + /* Function local objects are never NULL. */ + if (DECL_P (decl) + && (DECL_CONTEXT (decl) + && TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL + && auto_var_in_fn_p (decl, DECL_CONTEXT (decl)))) + return 1; + return -1; } @@ -13276,13 +13284,6 @@ tree_single_nonzero_warnv_p (tree t, bool *strict_overflow_p) if (nonzero_addr >= 0) return nonzero_addr; - /* Function local objects are never NULL. */ - if (DECL_P (base) - && (DECL_CONTEXT (base) - && TREE_CODE (DECL_CONTEXT (base)) == FUNCTION_DECL - && auto_var_in_fn_p (base, DECL_CONTEXT (base)))) - return true; - /* Constants are never weak. */ if (CONSTANT_CLASS_P (base)) return true; |