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| author | Alan Hayward <alan.hayward@arm.com> | 2016-06-15 15:45:47 +0000 |
|---|---|---|
| committer | Alan Hayward <alahay01@gcc.gnu.org> | 2016-06-15 15:45:47 +0000 |
| commit | 8dc35712198be33bcd9c89f8718dbbf108ff8fb1 (patch) | |
| tree | e3c64e29055216e3e44e08a56e4b3c0218fd2dbd /gcc | |
| parent | b8911cb870585c08881d3c424cb1e508e99b9ace (diff) | |
| download | gcc-8dc35712198be33bcd9c89f8718dbbf108ff8fb1.zip gcc-8dc35712198be33bcd9c89f8718dbbf108ff8fb1.tar.gz gcc-8dc35712198be33bcd9c89f8718dbbf108ff8fb1.tar.bz2 | |
re PR tree-optimization/71483 (g++ ICE at -O3 on valid code on x86_64-linux-gnu with “Floating point exception”)
2016-06-15 Alan Hayward <alan.hayward@arm.com>
gcc/
PR tree-optimization/71483
* tree-vect-loop.c (vectorizable_live_operation): Pick correct index
for slp
testsuite/
PR tree-optimization/71483
* g++.dg/vect/pr71483.c: New
From-SVN: r237483
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/vect/pr71483.c | 11 | ||||
| -rw-r--r-- | gcc/tree-vect-loop.c | 18 |
4 files changed, 29 insertions, 11 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 01d5090..88c1e0f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2016-06-15 Alan Hayward <alan.hayward@arm.com> + + PR tree-optimization/71483 + * tree-vect-loop.c (vectorizable_live_operation): Pick correct index + for slp + 2016-06-15 Martin Liska <mliska@suse.cz> * predict.c (tree_predict_by_opcode): Call predict_edge_def diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index d9dd04d..60c3192 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2016-06-15 Alan Hayward <alan.hayward@arm.com> + + PR tree-optimization/71483 + * g++.dg/vect/pr71483.c: New + 2016-06-15 Paolo Carlini <paolo.carlini@oracle.com> PR c++/70202 diff --git a/gcc/testsuite/g++.dg/vect/pr71483.c b/gcc/testsuite/g++.dg/vect/pr71483.c new file mode 100644 index 0000000..77f879c --- /dev/null +++ b/gcc/testsuite/g++.dg/vect/pr71483.c @@ -0,0 +1,11 @@ +/* { dg-do compile } */ +int b, c, d; +short *e; +void fn1() { + for (; b; b--) { + d = *e >> 2; + *e++ = d; + c = *e; + *e++ = d; + } +} diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c index 4c86785..a2413bf 100644 --- a/gcc/tree-vect-loop.c +++ b/gcc/tree-vect-loop.c @@ -6368,24 +6368,20 @@ vectorizable_live_operation (gimple *stmt, int num_scalar = SLP_TREE_SCALAR_STMTS (slp_node).length (); int num_vec = SLP_TREE_NUMBER_OF_VEC_STMTS (slp_node); - int scalar_per_vec = num_scalar / num_vec; - /* There are three possibilites here: - 1: All scalar stmts fit in a single vector. - 2: All scalar stmts fit multiple times into a single vector. - We must choose the last occurence of stmt in the vector. - 3: Scalar stmts are split across multiple vectors. - We must choose the correct vector and mod the lane accordingly. */ + /* Get the last occurrence of the scalar index from the concatenation of + all the slp vectors. Calculate which slp vector it is and the index + within. */ + int pos = (num_vec * nunits) - num_scalar + slp_index; + int vec_entry = pos / nunits; + int vec_index = pos % nunits; /* Get the correct slp vectorized stmt. */ - int vec_entry = slp_index / scalar_per_vec; vec_lhs = gimple_get_lhs (SLP_TREE_VEC_STMTS (slp_node)[vec_entry]); /* Get entry to use. */ - bitstart = build_int_cst (unsigned_type_node, - scalar_per_vec - (slp_index % scalar_per_vec)); + bitstart = build_int_cst (unsigned_type_node, vec_index); bitstart = int_const_binop (MULT_EXPR, bitsize, bitstart); - bitstart = int_const_binop (MINUS_EXPR, vec_bitsize, bitstart); } else { |