From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1035) id E0CBB3858CDB; Wed, 3 Aug 2022 09:07:53 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E0CBB3858CDB MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Richard Earnshaw To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-1948] cselib: add function to check if SET is redundant [PR106187] X-Act-Checkin: gcc X-Git-Author: Richard Earnshaw X-Git-Refname: refs/heads/master X-Git-Oldrev: a6b7fff06c5b27c4ffacf4c84ea1189254b9ad84 X-Git-Newrev: 64ce76d940501cb04d14a0d36752b4f93473531c Message-Id: <20220803090753.E0CBB3858CDB@sourceware.org> Date: Wed, 3 Aug 2022 09:07:53 +0000 (GMT) X-BeenThere: gcc-cvs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Aug 2022 09:07:54 -0000 https://gcc.gnu.org/g:64ce76d940501cb04d14a0d36752b4f93473531c commit r13-1948-g64ce76d940501cb04d14a0d36752b4f93473531c Author: Richard Earnshaw Date: Wed Aug 3 10:01:51 2022 +0100 cselib: add function to check if SET is redundant [PR106187] A SET operation that writes memory may have the same value as an earlier store but if the alias sets of the new and earlier store do not conflict then the set is not truly redundant. This can happen, for example, if objects of different types share a stack slot. To fix this we define a new function in cselib that first checks for equality and if that is successful then finds the earlier store in the value history and checks the alias sets. The routine is used in two places elsewhere in the compiler: cfgcleanup and postreload. gcc/ChangeLog: PR rtl-optimization/106187 * alias.h (mems_same_for_tbaa_p): Declare. * alias.cc (mems_same_for_tbaa_p): New function. * dse.cc (record_store): Use it instead of open-coding alias check. * cselib.h (cselib_redundant_set_p): Declare. * cselib.cc: Include alias.h (cselib_redundant_set_p): New function. * cfgcleanup.cc: (mark_effect): Use cselib_redundant_set_p instead of rtx_equal_for_cselib_p. * postreload.cc (reload_cse_simplify): Use cselib_redundant_set_p. (reload_cse_noop_set_p): Delete. Diff: --- gcc/alias.cc | 14 +++++++++++ gcc/alias.h | 1 + gcc/cfgcleanup.cc | 2 +- gcc/cselib.cc | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ gcc/cselib.h | 1 + gcc/dse.cc | 7 +----- gcc/postreload.cc | 15 ++---------- 7 files changed, 90 insertions(+), 20 deletions(-) diff --git a/gcc/alias.cc b/gcc/alias.cc index 8c08452e0ac..d54feb15268 100644 --- a/gcc/alias.cc +++ b/gcc/alias.cc @@ -389,6 +389,20 @@ refs_same_for_tbaa_p (tree earlier, tree later) || alias_set_subset_of (later_base_set, earlier_base_set)); } +/* Similar to refs_same_for_tbaa_p() but for use on MEM rtxs. */ +bool +mems_same_for_tbaa_p (rtx earlier, rtx later) +{ + gcc_assert (MEM_P (earlier)); + gcc_assert (MEM_P (later)); + + return ((MEM_ALIAS_SET (earlier) == MEM_ALIAS_SET (later) + || alias_set_subset_of (MEM_ALIAS_SET (later), + MEM_ALIAS_SET (earlier))) + && (!MEM_EXPR (earlier) + || refs_same_for_tbaa_p (MEM_EXPR (earlier), MEM_EXPR (later)))); +} + /* Returns a pointer to the alias set entry for ALIAS_SET, if there is such an entry, or NULL otherwise. */ diff --git a/gcc/alias.h b/gcc/alias.h index b2596518ac9..ee3db466763 100644 --- a/gcc/alias.h +++ b/gcc/alias.h @@ -40,6 +40,7 @@ tree reference_alias_ptr_type_1 (tree *); bool alias_ptr_types_compatible_p (tree, tree); int compare_base_decls (tree, tree); bool refs_same_for_tbaa_p (tree, tree); +bool mems_same_for_tbaa_p (rtx, rtx); /* This alias set can be used to force a memory to conflict with all other memories, creating a barrier across which no memory reference diff --git a/gcc/cfgcleanup.cc b/gcc/cfgcleanup.cc index 18047da7b24..a8b0139bb4d 100644 --- a/gcc/cfgcleanup.cc +++ b/gcc/cfgcleanup.cc @@ -208,7 +208,7 @@ mark_effect (rtx exp, regset nonequal) return false; case SET: - if (rtx_equal_for_cselib_p (SET_DEST (exp), SET_SRC (exp))) + if (cselib_redundant_set_p (exp)) return false; dest = SET_DEST (exp); if (dest == pc_rtx) diff --git a/gcc/cselib.cc b/gcc/cselib.cc index 6769beeeaf8..6a5609786fa 100644 --- a/gcc/cselib.cc +++ b/gcc/cselib.cc @@ -32,6 +32,7 @@ along with GCC; see the file COPYING3. If not see #include "dumpfile.h" #include "cselib.h" #include "function-abi.h" +#include "alias.h" /* A list of cselib_val structures. */ struct elt_list @@ -1157,6 +1158,75 @@ rtx_equal_for_cselib_1 (rtx x, rtx y, machine_mode memmode, int depth) return 1; } +/* Wrapper for rtx_equal_for_cselib_p to determine whether a SET is + truly redundant, taking into account aliasing information. */ +bool +cselib_redundant_set_p (rtx set) +{ + gcc_assert (GET_CODE (set) == SET); + rtx dest = SET_DEST (set); + if (cselib_reg_set_mode (dest) != GET_MODE (dest)) + return false; + + if (!rtx_equal_for_cselib_p (dest, SET_SRC (set))) + return false; + + while (GET_CODE (dest) == SUBREG + || GET_CODE (dest) == ZERO_EXTRACT + || GET_CODE (dest) == STRICT_LOW_PART) + dest = XEXP (dest, 0); + + if (!flag_strict_aliasing || !MEM_P (dest)) + return true; + + /* For a store we need to check that suppressing it will not change + the effective alias set. */ + rtx dest_addr = XEXP (dest, 0); + + /* Lookup the equivalents to the original dest (rather than just the + MEM). */ + cselib_val *src_val = cselib_lookup (SET_DEST (set), + GET_MODE (SET_DEST (set)), + 0, VOIDmode); + + if (src_val) + { + /* Walk the list of source equivalents to find the MEM accessing + the same location. */ + for (elt_loc_list *l = src_val->locs; l; l = l->next) + { + rtx src_equiv = l->loc; + while (GET_CODE (src_equiv) == SUBREG + || GET_CODE (src_equiv) == ZERO_EXTRACT + || GET_CODE (src_equiv) == STRICT_LOW_PART) + src_equiv = XEXP (src_equiv, 0); + + if (MEM_P (src_equiv)) + { + /* Match the MEMs by comparing the addresses. We can + only remove the later store if the earlier aliases at + least all the accesses of the later one. */ + if (rtx_equal_for_cselib_1 (dest_addr, XEXP (src_equiv, 0), + GET_MODE (dest), 0)) + return mems_same_for_tbaa_p (src_equiv, dest); + } + } + } + + /* We failed to find a recorded value in the cselib history, so try + the source of this set; this catches cases such as *p = *q when p + and q have the same value. */ + rtx src = SET_SRC (set); + while (GET_CODE (src) == SUBREG) + src = XEXP (src, 0); + + if (MEM_P (src) + && rtx_equal_for_cselib_1 (dest_addr, XEXP (src, 0), GET_MODE (dest), 0)) + return mems_same_for_tbaa_p (src, dest); + + return false; +} + /* Helper function for cselib_hash_rtx. Arguments like for cselib_hash_rtx, except that it hashes (plus:P x c). */ diff --git a/gcc/cselib.h b/gcc/cselib.h index 9ae65e6459e..b0905053ea5 100644 --- a/gcc/cselib.h +++ b/gcc/cselib.h @@ -83,6 +83,7 @@ extern void cselib_process_insn (rtx_insn *); extern bool fp_setter_insn (rtx_insn *); extern machine_mode cselib_reg_set_mode (const_rtx); extern int rtx_equal_for_cselib_1 (rtx, rtx, machine_mode, int); +extern bool cselib_redundant_set_p (rtx); extern int references_value_p (const_rtx, int); extern rtx cselib_expand_value_rtx (rtx, bitmap, int); typedef rtx (*cselib_expand_callback)(rtx, bitmap, int, void *); diff --git a/gcc/dse.cc b/gcc/dse.cc index 90a4c1f22db..0f7b0fb9796 100644 --- a/gcc/dse.cc +++ b/gcc/dse.cc @@ -1570,12 +1570,7 @@ record_store (rtx body, bb_info_t bb_info) width) /* We can only remove the later store if the earlier aliases at least all accesses the later one. */ - && ((MEM_ALIAS_SET (mem) == MEM_ALIAS_SET (s_info->mem) - || alias_set_subset_of (MEM_ALIAS_SET (mem), - MEM_ALIAS_SET (s_info->mem))) - && (!MEM_EXPR (s_info->mem) - || refs_same_for_tbaa_p (MEM_EXPR (s_info->mem), - MEM_EXPR (mem))))) + && mems_same_for_tbaa_p (s_info->mem, mem)) { if (GET_MODE (mem) == BLKmode) { diff --git a/gcc/postreload.cc b/gcc/postreload.cc index d1c99fe6dc9..41f61d32648 100644 --- a/gcc/postreload.cc +++ b/gcc/postreload.cc @@ -43,7 +43,6 @@ along with GCC; see the file COPYING3. If not see #include "function-abi.h" #include "rtl-iter.h" -static int reload_cse_noop_set_p (rtx); static bool reload_cse_simplify (rtx_insn *, rtx); static void reload_cse_regs_1 (void); static int reload_cse_simplify_set (rtx, rtx_insn *); @@ -74,16 +73,6 @@ reload_cse_regs (rtx_insn *first ATTRIBUTE_UNUSED) } } -/* See whether a single set SET is a noop. */ -static int -reload_cse_noop_set_p (rtx set) -{ - if (cselib_reg_set_mode (SET_DEST (set)) != GET_MODE (SET_DEST (set))) - return 0; - - return rtx_equal_for_cselib_p (SET_DEST (set), SET_SRC (set)); -} - /* Try to simplify INSN. Return true if the CFG may have changed. */ static bool reload_cse_simplify (rtx_insn *insn, rtx testreg) @@ -118,7 +107,7 @@ reload_cse_simplify (rtx_insn *insn, rtx testreg) this out, so it's safer to simplify before we delete. */ count += reload_cse_simplify_set (body, insn); - if (!count && reload_cse_noop_set_p (body)) + if (!count && cselib_redundant_set_p (body)) { if (check_for_inc_dec (insn)) delete_insn_and_edges (insn); @@ -157,7 +146,7 @@ reload_cse_simplify (rtx_insn *insn, rtx testreg) rtx part = XVECEXP (body, 0, i); if (GET_CODE (part) == SET) { - if (! reload_cse_noop_set_p (part)) + if (! cselib_redundant_set_p (part)) break; if (REG_P (SET_DEST (part)) && REG_FUNCTION_VALUE_P (SET_DEST (part)))