Hi! The simd clones IPA pass is gated on targetm.simd_clone.compute_vecsize_and_simdlen != NULL so when we are calling expand_simd_clones later, we shouldn't call it if it is NULL.
Bootstrapped/regtested on x86_64-linux and i686-linux, tested with powerpc64le-linux cross on the testcase, committed to trunk. 2018-02-19 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/84452 * tree-vect-patterns.c (vect_recog_pow_pattern): Don't call expand_simd_clones if targetm.simd_clone.compute_vecsize_and_simdlen is NULL. * gcc.dg/pr84452.c: New test. --- gcc/tree-vect-patterns.c.jj 2018-02-13 09:33:31.118560170 +0100 +++ gcc/tree-vect-patterns.c 2018-02-19 11:15:04.181270004 +0100 @@ -1113,7 +1113,8 @@ vect_recog_pow_pattern (vec<gimple *> *s cgraph_node *node = cgraph_node::get_create (exp_decl); if (node->simd_clones == NULL) { - if (node->definition) + if (targetm.simd_clone.compute_vecsize_and_simdlen == NULL + || node->definition) return NULL; expand_simd_clones (node); if (node->simd_clones == NULL) --- gcc/testsuite/gcc.dg/pr84452.c.jj 2018-02-19 11:17:37.045283314 +0100 +++ gcc/testsuite/gcc.dg/pr84452.c 2018-02-19 11:18:45.769289300 +0100 @@ -0,0 +1,14 @@ +/* PR tree-optimization/84452 */ +/* { dg-do compile } */ +/* { dg-options "-Ofast" } */ + +double pow (double, double) __attribute__((simd)); +double exp (double) __attribute__((simd)); +extern double a[1024], b[1024]; + +void +foo (void) +{ + for (int i = 0; i < 1024; ++i) + a[i] = pow (2.0, b[i]); +} Jakub