diff options
author | Richard Henderson <rth@redhat.com> | 2000-11-08 16:26:34 -0800 |
---|---|---|
committer | Richard Henderson <rth@gcc.gnu.org> | 2000-11-08 16:26:34 -0800 |
commit | c32e1e6fbc96ee261728dbbc5da6fd69619b15b8 (patch) | |
tree | 424ab1377c7f1bbb66c3532a2d7d64391c87ef02 /gcc/flow.c | |
parent | adb84b4254d23c4ff58f53c4f48971b6cd8395d1 (diff) | |
download | gcc-c32e1e6fbc96ee261728dbbc5da6fd69619b15b8.zip gcc-c32e1e6fbc96ee261728dbbc5da6fd69619b15b8.tar.gz gcc-c32e1e6fbc96ee261728dbbc5da6fd69619b15b8.tar.bz2 |
flow.c (init_propagate_block_info): Protect the rtx stored in mem_set_list from modification by find_auto_inc.
* flow.c (init_propagate_block_info): Protect the rtx stored in
mem_set_list from modification by find_auto_inc.
(mark_set_1): Likewise.
From-SVN: r37330
Diffstat (limited to 'gcc/flow.c')
-rw-r--r-- | gcc/flow.c | 26 |
1 files changed, 24 insertions, 2 deletions
@@ -3930,7 +3930,21 @@ init_propagate_block_info (bb, live, local_set, flags) || (GET_CODE (XEXP (mem, 0)) == PLUS && XEXP (XEXP (mem, 0), 0) == frame_pointer_rtx && GET_CODE (XEXP (XEXP (mem, 0), 1)) == CONST_INT)) - pbi->mem_set_list = alloc_EXPR_LIST (0, mem, pbi->mem_set_list); + { +#ifdef AUTO_INC_DEC + /* Store a copy of mem, otherwise the address may be scrogged + by find_auto_inc. This matters because insn_dead_p uses + an rtx_equal_p check to determine if two addresses are + the same. This works before find_auto_inc, but fails + after find_auto_inc, causing discrepencies between the + set of live registers calculated during the + calculate_global_regs_live phase and what actually exists + after flow completes, leading to aborts. */ + if (flags & PROP_AUTOINC) + mem = shallow_copy_rtx (mem); +#endif + pbi->mem_set_list = alloc_EXPR_LIST (0, mem, pbi->mem_set_list); + } } } @@ -4561,7 +4575,15 @@ mark_set_1 (pbi, code, reg, cond, insn, flags) everything that invalidates it. To be safe, don't eliminate any stores though SP; none of them should be redundant anyway. */ && ! reg_mentioned_p (stack_pointer_rtx, reg)) - pbi->mem_set_list = alloc_EXPR_LIST (0, reg, pbi->mem_set_list); + { +#ifdef AUTO_INC_DEC + /* Store a copy of mem, otherwise the address may be + scrogged by find_auto_inc. */ + if (flags & PROP_AUTOINC) + reg = shallow_copy_rtx (reg); +#endif + pbi->mem_set_list = alloc_EXPR_LIST (0, reg, pbi->mem_set_list); + } } if (GET_CODE (reg) == REG |