From: Andreas Krebbel Date: Mon, 24 Oct 2011 20:14:35 +0000 (+0000) Subject: tree-ssa-strlen.c (get_string_length): Change assertion to STPCPY. X-Git-Tag: releases/gcc-4.7.0~2850 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=93a90db6b0ba863657dd45ecaf4c424ca4ec1acb;p=thirdparty%2Fgcc.git tree-ssa-strlen.c (get_string_length): Change assertion to STPCPY. 2011-10-24 Andreas Krebbel * tree-ssa-strlen.c (get_string_length): Change assertion to STPCPY. (zero_length_string): Change assertion to accept strinfo without length but with stmt instead. Set the endptr pointer also if starting a new chain. (adjust_related_strinfos): Ignore strinfos marked for delayed length computation. (handle_builtin_strcpy): Mark earlier strinfo elements also for delayed length computation. 2011-10-24 Andreas Krebbel * gcc.dg/strlenopt-22.c: New testcase. * gcc.dg/strlenopt-4.c: Change scan value for s390(x). From-SVN: r180402 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index efe02f745d33..bd04d776c187 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,14 @@ +2011-10-24 Andreas Krebbel + + * tree-ssa-strlen.c (get_string_length): Change assertion to STPCPY. + (zero_length_string): Change assertion to accept strinfo without + length but with stmt instead. + Set the endptr pointer also if starting a new chain. + (adjust_related_strinfos): Ignore strinfos marked for delayed + length computation. + (handle_builtin_strcpy): Mark earlier strinfo elements also for + delayed length computation. + 2011-10-24 Georg-Johann Lay PR target/50820 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 822fde544e0c..0e7ee4c98e2d 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2011-10-24 Andreas Krebbel + + * gcc.dg/strlenopt-22.c: New testcase. + * gcc.dg/strlenopt-4.c: Change scan value for s390(x). + 2011-10-24 Uros Bizjak * gcc.target/i386/sse-5.c (dg-options): Add -mno-sse. diff --git a/gcc/testsuite/gcc.dg/strlenopt-22.c b/gcc/testsuite/gcc.dg/strlenopt-22.c new file mode 100644 index 000000000000..541bfdce467f --- /dev/null +++ b/gcc/testsuite/gcc.dg/strlenopt-22.c @@ -0,0 +1,41 @@ +/* { dg-do run } */ +/* { dg-options "-O2 -fdump-tree-strlen" } */ + +#define USE_GNU +#include "strlenopt.h" + +__attribute__((noinline, noclone)) size_t +bar (char *p, char *q) +{ + size_t l1, l2, l3; + char *r = strchr (p, '\0'); + strcpy (r, "abcde"); + char *s = strchr (r, '\0'); + strcpy (s, q); + l1 = strlen (p); + l2 = strlen (r); + l3 = strlen (s); + return l1 + l2 + l3; +} + +int +main () +{ + char buf[16] = "01234"; + + if (bar (buf, "56789") != 30) + abort (); + + if (memcmp (buf, "01234abcde56789", 16) != 0) + abort (); + + return 0; +} + +/* { dg-final { scan-tree-dump-times "strlen \\(" 0 "strlen" } } */ +/* { dg-final { scan-tree-dump-times "memcpy \\(" 1 "strlen" } } */ +/* { dg-final { scan-tree-dump-times "strcpy \\(" 0 "strlen" } } */ +/* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" } } */ +/* { dg-final { scan-tree-dump-times "strchr \\(" 1 "strlen" } } */ +/* { dg-final { scan-tree-dump-times "stpcpy \\(" 1 "strlen" } } */ +/* { dg-final { cleanup-tree-dump "strlen" } } */ diff --git a/gcc/testsuite/gcc.dg/strlenopt-4.c b/gcc/testsuite/gcc.dg/strlenopt-4.c index beea4959245f..5997d31985fa 100644 --- a/gcc/testsuite/gcc.dg/strlenopt-4.c +++ b/gcc/testsuite/gcc.dg/strlenopt-4.c @@ -66,10 +66,16 @@ main () return 0; } -/* { dg-final { scan-tree-dump-times "strlen \\(" 3 "strlen" } } */ +/* For targets providing a movstr pattern strcat is already decomposed + into strlen + strcpy by fold_builtin_strcat. */ + +/* { dg-final { scan-tree-dump-times "strlen \\(" 3 "strlen" { target { ! s390*-*-* } } } } */ +/* { dg-final { scan-tree-dump-times "strlen \\(" 6 "strlen" { target s390*-*-* } } } */ /* { dg-final { scan-tree-dump-times "memcpy \\(" 4 "strlen" } } */ -/* { dg-final { scan-tree-dump-times "strcpy \\(" 3 "strlen" } } */ -/* { dg-final { scan-tree-dump-times "strcat \\(" 3 "strlen" } } */ +/* { dg-final { scan-tree-dump-times "strcpy \\(" 3 "strlen" { target { ! s390*-*-* } } } } */ +/* { dg-final { scan-tree-dump-times "strcpy \\(" 6 "strlen" { target s390*-*-* } } } */ +/* { dg-final { scan-tree-dump-times "strcat \\(" 3 "strlen" { target { ! s390*-*-* } } } } */ +/* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" { target s390*-*-* } } } */ /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen" } } */ /* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen" } } */ /* { dg-final { cleanup-tree-dump "strlen" } } */ diff --git a/gcc/tree-ssa-strlen.c b/gcc/tree-ssa-strlen.c index 697340f535aa..72da15e9893e 100644 --- a/gcc/tree-ssa-strlen.c +++ b/gcc/tree-ssa-strlen.c @@ -397,7 +397,7 @@ get_string_length (strinfo si) callee = gimple_call_fndecl (stmt); gcc_assert (callee && DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL); lhs = gimple_call_lhs (stmt); - gcc_assert (builtin_decl_implicit_p (BUILT_IN_STRCPY)); + gcc_assert (builtin_decl_implicit_p (BUILT_IN_STPCPY)); /* unshare_strinfo is intentionally not called here. The (delayed) transformation of strcpy or strcat into stpcpy is done at the place of the former strcpy/strcat call and so can affect all the strinfos @@ -588,13 +588,13 @@ zero_length_string (tree ptr, strinfo chainsi) || si->prev != chainsi->idx) break; } - gcc_assert (chainsi->length); + gcc_assert (chainsi->length || chainsi->stmt); if (chainsi->endptr == NULL_TREE) { chainsi = unshare_strinfo (chainsi); chainsi->endptr = ptr; } - if (integer_zerop (chainsi->length)) + if (chainsi->length && integer_zerop (chainsi->length)) { if (chainsi->next) { @@ -626,6 +626,8 @@ zero_length_string (tree ptr, strinfo chainsi) if (chainsi->first == 0) chainsi->first = chainsi->idx; chainsi->next = idx; + if (chainsi->endptr == NULL_TREE) + chainsi->endptr = ptr; si->prev = chainsi->idx; si->first = chainsi->first; si->writable = chainsi->writable; @@ -654,11 +656,19 @@ adjust_related_strinfos (location_t loc, strinfo origsi, tree adj) tree tem; si = unshare_strinfo (si); - gcc_assert (si->length); - tem = fold_convert_loc (loc, TREE_TYPE (si->length), adj); - si->length = fold_build2_loc (loc, PLUS_EXPR, - TREE_TYPE (si->length), si->length, - tem); + if (si->length) + { + tem = fold_convert_loc (loc, TREE_TYPE (si->length), adj); + si->length = fold_build2_loc (loc, PLUS_EXPR, + TREE_TYPE (si->length), si->length, + tem); + } + else if (si->stmt != NULL) + /* Delayed length computation is unaffected. */ + ; + else + gcc_unreachable (); + si->endptr = NULL_TREE; si->dont_invalidate = true; } @@ -1117,10 +1127,30 @@ handle_builtin_strcpy (enum built_in_function bcode, gimple_stmt_iterator *gsi) if (dsi->length == NULL_TREE) { + strinfo chainsi; + /* If string length of src is unknown, use delayed length computation. If string lenth of dst will be needed, it can be computed by transforming this strcpy call into stpcpy and subtracting dst from the return value. */ + + /* Look for earlier strings whose length could be determined if + this strcpy is turned into an stpcpy. */ + + if (dsi->prev != 0 && (chainsi = verify_related_strinfos (dsi)) != NULL) + { + for (; chainsi && chainsi != dsi; chainsi = get_strinfo (chainsi->next)) + { + /* When setting a stmt for delayed length computation + prevent all strinfos through dsi from being + invalidated. */ + chainsi = unshare_strinfo (chainsi); + chainsi->stmt = stmt; + chainsi->length = NULL_TREE; + chainsi->endptr = NULL_TREE; + chainsi->dont_invalidate = true; + } + } dsi->stmt = stmt; return; }