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Fix ICE with pathologically large frames

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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.
This commit is contained in:
Eric Botcazou 2021-03-03 12:25:03 +01:00
parent f1b1306460
commit 357c435068
1 changed files with 4 additions and 1 deletions
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5
gcc/config/i386/i386.c
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@ -6660,7 +6660,8 @@ 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)
@ -6678,6 +6679,8 @@ 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;
}
}