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| author | Jakub Jelinek <jakub@redhat.com> | 2014-11-19 10:49:18 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2014-11-19 10:49:18 +0100 |
| commit | 5620052d3d8c020cd10d88d79eb8208433536d56 (patch) | |
| tree | 979c09b8ed38c5c7392a99152555b651831af48a /gcc/internal-fn.c | |
| parent | a2a2fe4bfaff0a8e97698b92296ca760222d2605 (diff) | |
| download | gcc-5620052d3d8c020cd10d88d79eb8208433536d56.zip gcc-5620052d3d8c020cd10d88d79eb8208433536d56.tar.gz gcc-5620052d3d8c020cd10d88d79eb8208433536d56.tar.bz2 | |
re PR sanitizer/63520 (ICE: in get_biv_step, at loop-iv.c:824 with -fsanitize=undefined on ppc64)
PR sanitizer/63520
* internal-fn.c (expand_ubsan_result_store): New function.
(expand_addsub_overflow, expand_neg_overflow, expand_mul_overflow):
Use it instead of just emit_move_insn.
* c-c++-common/ubsan/pr63520.c: New test.
From-SVN: r217758
Diffstat (limited to 'gcc/internal-fn.c')
| -rw-r--r-- | gcc/internal-fn.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/gcc/internal-fn.c b/gcc/internal-fn.c index 073d941..0cb15b2 100644 --- a/gcc/internal-fn.c +++ b/gcc/internal-fn.c @@ -395,6 +395,21 @@ expand_arith_overflow_result_store (tree lhs, rtx target, write_complex_part (target, lres, false); } +/* Helper for expand_*_overflow. Store RES into TARGET. */ + +static void +expand_ubsan_result_store (rtx target, rtx res) +{ + if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target)) + /* If this is a scalar in a register that is stored in a wider mode + than the declared mode, compute the result into its declared mode + and then convert to the wider mode. Our value is the computed + expression. */ + convert_move (SUBREG_REG (target), res, SUBREG_PROMOTED_SIGN (target)); + else + emit_move_insn (target, res); +} + /* Add sub/add overflow checking to the statement STMT. CODE says whether the operation is +, or -. */ @@ -809,7 +824,7 @@ expand_addsub_overflow (location_t loc, tree_code code, tree lhs, if (lhs) { if (is_ubsan) - emit_move_insn (target, res); + expand_ubsan_result_store (target, res); else { if (do_xor) @@ -904,7 +919,7 @@ expand_neg_overflow (location_t loc, tree lhs, tree arg1, bool is_ubsan) if (lhs) { if (is_ubsan) - emit_move_insn (target, res); + expand_ubsan_result_store (target, res); else expand_arith_overflow_result_store (lhs, target, mode, res); } @@ -1590,7 +1605,7 @@ expand_mul_overflow (location_t loc, tree lhs, tree arg0, tree arg1, if (lhs) { if (is_ubsan) - emit_move_insn (target, res); + expand_ubsan_result_store (target, res); else expand_arith_overflow_result_store (lhs, target, mode, res); } |