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| author | Marc Glisse <marc.glisse@inria.fr> | 2017-04-29 16:39:25 +0200 |
|---|---|---|
| committer | Marc Glisse <glisse@gcc.gnu.org> | 2017-04-29 14:39:25 +0000 |
| commit | 4212aecdf8c4bd99b681fcfc2396844303bab39d (patch) | |
| tree | 003459e0c47e58a983513c0fb523ccb389c52f19 /gcc | |
| parent | fe75f73248425f0f4c0d2196811ce1d7afb9c09f (diff) | |
| download | gcc-4212aecdf8c4bd99b681fcfc2396844303bab39d.zip gcc-4212aecdf8c4bd99b681fcfc2396844303bab39d.tar.gz gcc-4212aecdf8c4bd99b681fcfc2396844303bab39d.tar.bz2 | |
Add st[pr]ncpy to stmt_kills_ref_p
2017-04-29 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/80487
gcc/
* tree-ssa-alias.c (stmt_kills_ref_p): Handle stpncpy and strncpy.
gcc/testsuite/
* gcc.dg/tree-ssa/strncpy-1.c: New file.
From-SVN: r247408
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/strncpy-1.c | 16 | ||||
| -rw-r--r-- | gcc/tree-ssa-alias.c | 2 |
4 files changed, 28 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a208292..3e34747 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2017-04-29 Marc Glisse <marc.glisse@inria.fr> + + PR tree-optimization/80487 + * tree-ssa-alias.c (stmt_kills_ref_p): Handle stpncpy and strncpy. + 2017-04-29 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org> PR tree-optimization/79697 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 59f1a31..2d3d02b 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2017-04-29 Marc Glisse <marc.glisse@inria.fr> + + PR tree-optimization/80487 + * gcc.dg/tree-ssa/strncpy-1.c: New file. + 2017-04-29 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org> PR tree-optimization/79697 diff --git a/gcc/testsuite/gcc.dg/tree-ssa/strncpy-1.c b/gcc/testsuite/gcc.dg/tree-ssa/strncpy-1.c new file mode 100644 index 0000000..751eaea --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/strncpy-1.c @@ -0,0 +1,16 @@ +/* { dg-do compile } */ +/* { dg-options "-O -fdump-tree-optimized" } */ + +void sink (void*); + +void f (const char *s) +{ + char a[256]; + + __builtin_memset (a, 0, sizeof a); // redundant memset + __builtin_strncpy (a, s, sizeof a); + + sink (a); +} + +/* { dg-final { scan-tree-dump-not "memset" "optimized" } } */ diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index 0dcb273..8cab159 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -2538,6 +2538,8 @@ stmt_kills_ref_p (gimple *stmt, ao_ref *ref) case BUILT_IN_MEMPCPY_CHK: case BUILT_IN_MEMMOVE_CHK: case BUILT_IN_MEMSET_CHK: + case BUILT_IN_STRNCPY: + case BUILT_IN_STPNCPY: { /* For a must-alias check we need to be able to constrain the access properly. */ |