diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/expr.c | 4 | ||||
| -rw-r--r-- | gcc/expr.h | 3 | ||||
| -rw-r--r-- | gcc/internal-fn.c | 7 | ||||
| -rw-r--r-- | gcc/testsuite/c-c++-common/pr102285.c | 10 |
4 files changed, 20 insertions, 4 deletions
@@ -5305,7 +5305,7 @@ get_bit_range (poly_uint64_pod *bitstart, poly_uint64_pod *bitend, tree exp, has non-BLKmode. DECL_RTL must not be a MEM; if DECL_RTL was not set yet, return false. */ -static inline bool +bool non_mem_decl_p (tree base) { if (!DECL_P (base) @@ -5322,7 +5322,7 @@ non_mem_decl_p (tree base) /* Returns true if REF refers to an object that does not reside in memory and has non-BLKmode. */ -static inline bool +bool mem_ref_refers_to_non_mem_p (tree ref) { tree base; @@ -346,4 +346,7 @@ extern void expand_operands (tree, tree, rtx, rtx*, rtx*, /* Return an rtx for the size in bytes of the value of an expr. */ extern rtx expr_size (tree); +extern bool mem_ref_refers_to_non_mem_p (tree); +extern bool non_mem_decl_p (tree); + #endif /* GCC_EXPR_H */ diff --git a/gcc/internal-fn.c b/gcc/internal-fn.c index ef5dc90..1101452 100644 --- a/gcc/internal-fn.c +++ b/gcc/internal-fn.c @@ -3015,8 +3015,11 @@ expand_DEFERRED_INIT (internal_fn, gcall *stmt) reg_lhs = true; else { - rtx tem = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE); - reg_lhs = !MEM_P (tem); + tree lhs_base = lhs; + while (handled_component_p (lhs_base)) + lhs_base = TREE_OPERAND (lhs_base, 0); + reg_lhs = (mem_ref_refers_to_non_mem_p (lhs_base) + || non_mem_decl_p (lhs_base)); } if (!reg_lhs) diff --git a/gcc/testsuite/c-c++-common/pr102285.c b/gcc/testsuite/c-c++-common/pr102285.c new file mode 100644 index 0000000..644054b --- /dev/null +++ b/gcc/testsuite/c-c++-common/pr102285.c @@ -0,0 +1,10 @@ +/* { dg-do compile } */ +/* { dg-options "-O -ftrivial-auto-var-init=zero -Wuninitialized" } */ + +int +qy (void) +{ + int tw = 4; + int fb[tw]; + return fb[2]; /* { dg-warning "uninitialized" } */ +} |