diff options
Diffstat (limited to 'gcc/doc/md.texi')
| -rw-r--r-- | gcc/doc/md.texi | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi index dcfba92..2974dcf 100644 --- a/gcc/doc/md.texi +++ b/gcc/doc/md.texi @@ -5037,11 +5037,19 @@ operations in addition to updating the stack pointer. @item @samp{check_stack} If stack checking cannot be done on your system by probing the stack with a load or store instruction (@pxref{Stack Checking}), define this pattern -to perform the needed check and signaling an error if the stack -has overflowed. The single operand is the location in the stack furthest -from the current stack pointer that you need to validate. Normally, -on machines where this pattern is needed, you would obtain the stack -limit from a global or thread-specific variable or register. +to perform the needed check and signal an error if the stack has overflowed. +The single operand is the address in the stack furthest from the current +stack pointer that you need to validate. Normally, on machines where this +pattern is needed, you would obtain the stack limit from a global or +thread-specific variable or register. + +@cindex @code{probe_stack} instruction pattern +@item @samp{probe_stack} +If stack checking can be done on your system by probing the stack but doing +it with a load or store instruction is not optimal (@pxref{Stack Checking}), +define this pattern to do the probing differently and signal an error if +the stack has overflowed. The single operand is the memory location in the +stack that needs to be probed. @cindex @code{nonlocal_goto} instruction pattern @item @samp{nonlocal_goto} |