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2016 Mar 23
1
Redundant load in llvm's codegen compares to gcc when accessing escaped pointer?
...es not seem to square (IMHO) with the ubiquitous practice of having 0- or 1-length array at the end of a struct and then allocating additional elements for it using malloc, or the so-called "struct hack": http://c-faq.com/struct/structhack.html For example: typedef struct { enum inst_type type; unsigned num_ops; struct operand ops[1]; } inst; // allocate an instruction with specified number of operands int *allocate_inst(unsigned num_operands) { char *mem = malloc(sizeof(inst) + sizeof(struct operand) * (num_operands-1)); return (inst *) mem; } Or maybe th...
2016 Mar 22
0
Redundant load in llvm's codegen compares to gcc when accessing escaped pointer?
Reply from Michael: &x points to the start of object x, and &x - something (something != 0) points outside object x. 'c' was a complete object, so &c-8 points outside any object, hence the formation of that pointer is already invalid (as is its dereference). https://gcc.gnu.org/ml/gcc/2016-03/msg00185.html >>On Fri, Mar 18, 2016 at 8:46 AM, Daniel Berlin <dberlin
2016 Mar 19
2
Redundant load in llvm's codegen compares to gcc when accessing escaped pointer?
Agree, and I did : ) Please refer to this mailing list: https://gcc.gnu.org/ml/gcc/2016-03/msg00179.html On Sat, Mar 19, 2016 at 1:25 AM, Daniel Berlin <dberlin at dberlin.org> wrote: > I suspect you should just go ask #1 on the gcc mailing list and see what > the answer is. > We are basically trying to figure out their reasoning, but we should > instead just go ask what it is