diff options
Diffstat (limited to 'gcc/function.c')
| -rw-r--r-- | gcc/function.c | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/gcc/function.c b/gcc/function.c index 851dd246ee9..73527bc037e 100644 --- a/gcc/function.c +++ b/gcc/function.c @@ -70,6 +70,10 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #define LOCAL_ALIGNMENT(TYPE, ALIGNMENT) ALIGNMENT #endif +#ifndef STACK_ALIGNMENT_NEEDED +#define STACK_ALIGNMENT_NEEDED 1 +#endif + /* Some systems use __main in a way incompatible with its use in gcc, in these cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to give the same symbol without quotes for an alternative entry point. You @@ -566,16 +570,27 @@ assign_stack_local_1 (mode, size, align, function) frame_off = STARTING_FRAME_OFFSET % frame_alignment; frame_phase = frame_off ? frame_alignment - frame_off : 0; - /* Round frame offset to that alignment. - We must be careful here, since FRAME_OFFSET might be negative and - division with a negative dividend isn't as well defined as we might - like. So we instead assume that ALIGNMENT is a power of two and - use logical operations which are unambiguous. */ + /* Round the frame offset to the specified alignment. The default is + to always honor requests to align the stack but a port may choose to + do its own stack alignment by defining STACK_ALIGNMENT_NEEDED. */ + if (STACK_ALIGNMENT_NEEDED + || mode != BLKmode + || size != 0) + { + /* We must be careful here, since FRAME_OFFSET might be negative and + division with a negative dividend isn't as well defined as we might + like. So we instead assume that ALIGNMENT is a power of two and + use logical operations which are unambiguous. */ #ifdef FRAME_GROWS_DOWNWARD - function->x_frame_offset = FLOOR_ROUND (function->x_frame_offset - frame_phase, alignment) + frame_phase; + function->x_frame_offset + = (FLOOR_ROUND (function->x_frame_offset - frame_phase, alignment) + + frame_phase); #else - function->x_frame_offset = CEIL_ROUND (function->x_frame_offset - frame_phase, alignment) + frame_phase; + function->x_frame_offset + = (CEIL_ROUND (function->x_frame_offset - frame_phase, alignment) + + frame_phase); #endif + } /* On a big-endian machine, if we are allocating more space than we will use, use the least significant bytes of those that are allocated. */ |
