https://bugs.llvm.org/show_bug.cgi?id=33834
Bug ID: 33834
Summary: [ms_abi] Big structures arguments are not passed
correctly (x64)
Product: clang
Version: 3.9
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: pi...@codeweavers.com
CC: llvm-bugs@lists.llvm.org
An example of function that will be called incorrectly:
typedef struct {
int big[8];
} big;
extern void __attribute__((ms_abi)) call_func_with_struct_args(big a, big b,
big c, big d, big e);
...
big args[5];
memset(args, 0, sizeof(args));
call_func_with_struct_args(args[0], args[1], args[2], args[3], args[4]);
MSVC passes all structures indirectly (even for arguments passed on stack).
Clang passes first four arguments as pointers. Fifth argument is passed
incorrectly (this breaks some functionality in wine project).
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