Fix ICE with pathologically large frames

gcc/
	PR target/99234
	* config/i386/i386.c (ix86_compute_frame_layout): For a SEH target,
	point back the hard frame pointer to its default location when the
	frame is larger than SEH_MAX_FRAME_SIZE.

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 7b8036613664b0670633de5f2f894babf0e0720b..e23f92b58cc0d99d9efc61d2b839190d898e0017 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -6357,7 +6357,8 @@ ix86_compute_frame_layout (void)
       frame->hard_frame_pointer_offset = frame->sse_reg_save_offset;
 
       /* If we can leave the frame pointer where it is, do so.  Also, return
-        the establisher frame for __builtin_frame_address (0).  */
+        the establisher frame for __builtin_frame_address (0) or else if the
+        frame overflows the SEH maximum frame size.  */
       const HOST_WIDE_INT diff
        = frame->stack_pointer_offset - frame->hard_frame_pointer_offset;
       if (diff <= 255)
@@ -6375,6 +6376,8 @@ ix86_compute_frame_layout (void)
             frame that is addressable with 8-bit offsets.  */
          frame->hard_frame_pointer_offset = frame->stack_pointer_offset - 128;
        }
+      else
+       frame->hard_frame_pointer_offset = frame->hfp_save_offset;
     }
 }