projects / packages / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 64f9f7bb JR |
1 | #! /bin/sh -e |
| 2 | ||
| 3 | if [ $# -eq 3 -a "$2" = '-d' ]; then | |
| 4 | pdir="-d $3" | |
| 5 | elif [ $# -ne 1 ]; then | |
| 6 | echo >&2 "`basename $0`: script expects -patch|-unpatch as argument" | |
| 7 | exit 1 | |
| 8 | fi | |
| 9 | case "$1" in | |
| 10 | -patch) patch $pdir -f --no-backup-if-mismatch -p0 < $0;; | |
| 11 | -unpatch) patch $pdir -f --no-backup-if-mismatch -R -p0 < $0;; | |
| 12 | *) | |
| 13 | echo >&2 "`basename $0`: script expects -patch|-unpatch as argument" | |
| 14 | exit 1 | |
| 15 | esac | |
| 16 | exit 0 | |
| 17 | ||
| 18 | # DP: From: David Huggins-Daines <dhuggins@linuxcare.com> | |
| 19 | Sender: <dhd@thepuffingroup.com> | |
| 20 | # DP: To: 55263@bugs.debian.org | |
| 21 | # DP: Subject: Bug#55263: [PATCH] fixed in 2.96 CVS, here's a backport of the diff | |
| 22 | # DP: Date: Wed, 01 Mar 2000 19:28:03 -0500 | |
| 23 | ||
| 24 | Hi, | |
| 25 | ||
| 26 | # DP: I've found the minimal set of optimization flags that will produce | |
| 27 | # DP: this error (the -O is necessary): | |
| 28 | # DP: | |
| 29 | # DP: [dhd@doppelbock]:~/src/debian/ncurses4.2-4.2/obj_s$ cc -I../ncurses -I. -DNDEBUG -I. -I../include -DHAVE_CONFIG_H -DTERMINFO=\"/usr/share/terminfo\" -O -fcse-skip-blocks -fexpensive-optimizations -frerun-cse-after-loop -frerun-loop-opt -D_REENTRANT -fPIC -c ../ncurses/softscroll.c | |
| 30 | # DP: ../ncurses/softscroll.c: In function `_nc_perform_scroll': | |
| 31 | # DP: ../ncurses/softscroll.c:257: internal error--unrecognizable insn: | |
| 32 | # DP: | |
| 33 | # DP: (insn 1213 1212 1215 (set (reg/v:DI 531) | |
| 34 | # DP: (mem/f:DI (symbol_ref:DI ("SP")) 0)) -1 (nil) | |
| 35 | # DP: (nil)) | |
| 36 | # DP: | |
| 37 | # DP: However, it seems that the bug is fixed in 2.96 from current CVS. | |
| 38 | # DP: Here is the diff from 2.95.2 to 2.96 that solves the problem (I've | |
| 39 | # DP: tested it, it seems to work): | |
| 40 | ||
| 41 | --- gcc/emit-rtl.c.2.95.2 Wed Mar 1 18:19:18 2000 | |
| 42 | +++ gcc/emit-rtl.c Wed Mar 1 18:23:29 2000 | |
| 43 | @@ -1856,25 +1728,17 @@ | |
| 44 | return x; | |
| 45 | ||
| 46 | case MEM: | |
| 47 | - /* A MEM is allowed to be shared if its address is constant | |
| 48 | - or is a constant plus one of the special registers. */ | |
| 49 | - if (CONSTANT_ADDRESS_P (XEXP (x, 0)) | |
| 50 | - || XEXP (x, 0) == virtual_stack_vars_rtx | |
| 51 | - || XEXP (x, 0) == virtual_incoming_args_rtx) | |
| 52 | + /* A MEM is allowed to be shared if its address is constant. | |
| 53 | + | |
| 54 | + We used to allow sharing of MEMs which referenced | |
| 55 | + virtual_stack_vars_rtx or virtual_incoming_args_rtx, but | |
| 56 | + that can lose. instantiate_virtual_regs will not unshare | |
| 57 | + the MEMs, and combine may change the structure of the address | |
| 58 | + because it looks safe and profitable in one context, but | |
| 59 | + in some other context it creates unrecognizable RTL. */ | |
| 60 | + if (CONSTANT_ADDRESS_P (XEXP (x, 0))) | |
| 61 | return x; | |
| 62 | ||
| 63 | - if (GET_CODE (XEXP (x, 0)) == PLUS | |
| 64 | - && (XEXP (XEXP (x, 0), 0) == virtual_stack_vars_rtx | |
| 65 | - || XEXP (XEXP (x, 0), 0) == virtual_incoming_args_rtx) | |
| 66 | - && CONSTANT_ADDRESS_P (XEXP (XEXP (x, 0), 1))) | |
| 67 | - { | |
| 68 | - /* This MEM can appear in more than one place, | |
| 69 | - but its address better not be shared with anything else. */ | |
| 70 | - if (! x->used) | |
| 71 | - XEXP (x, 0) = copy_rtx_if_shared (XEXP (x, 0)); | |
| 72 | - x->used = 1; | |
| 73 | - return x; | |
| 74 | - } | |
| 75 | break; | |
| 76 | ||
| 77 | default: | |
| 78 | ||
| 79 | ||
| 80 | ||
| 81 | -- | |
| 82 | David Huggins-Daines, Senior Linux Consultant, Linuxcare, Inc. | |
| 83 | 613.562.1239 tel | |
| 84 | dhuggins@linuxcare.com, http://www.linuxcare.com/ | |
| 85 | Linuxcare. Support for the revolution. |