From ffe308e4fcf2f276c87fd405596569ba52ad0a29 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Wed, 15 Mar 2017 17:32:46 +0000 Subject: Fix test-math-vector-sincos.h aliasing. x86_64 libmvec tests have been failing to build lately with GCC mainline with -Wuninitialized errors, and Markus Trippelsdorf traced this to an aliasing issue . This patch fixes the aliasing issue, so that the vectors-of-pointers are initialized using a union instead of pointer casts. This also fixes the testsuite build failures with GCC mainline. Tested for x86_64 (full testsuite with GCC 6; testsuite build with GCC mainline with build-many-glibcs.py). * sysdeps/x86/fpu/test-math-vector-sincos.h (INIT_VEC_PTRS_LOOP): Use a union when storing pointers. (VECTOR_WRAPPER_fFF_2): Do not take address of integer vector and cast result when passing to INIT_VEC_PTRS_LOOP. (VECTOR_WRAPPER_fFF_3): Likewise. (VECTOR_WRAPPER_fFF_4): Likewise. --- sysdeps/x86/fpu/test-math-vector-sincos.h | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) (limited to 'sysdeps/x86/fpu') diff --git a/sysdeps/x86/fpu/test-math-vector-sincos.h b/sysdeps/x86/fpu/test-math-vector-sincos.h index 5043b32563..95282a3ac7 100644 --- a/sysdeps/x86/fpu/test-math-vector-sincos.h +++ b/sysdeps/x86/fpu/test-math-vector-sincos.h @@ -17,14 +17,14 @@ License along with the GNU C Library; if not, see . */ -#define INIT_VEC_PTRS_LOOP(vec, val, len) \ - do \ - { \ - for (i = 0; i < len; i++) \ - { \ - vec[i] = &val[i]; \ - } \ - } \ +#define INIT_VEC_PTRS_LOOP(vec, val, len) \ + do \ + { \ + union { VEC_INT_TYPE v; __typeof__ ((val)[0]) *a[(len)]; } u; \ + for (i = 0; i < len; i++) \ + u.a[i] = &(val)[i]; \ + (vec) = u.v; \ + } \ while (0) /* Wrapper for vector sincos/sincosf compatible with x86_64 and x32 variants @@ -40,8 +40,8 @@ void scalar_func (FLOAT x, FLOAT * r, FLOAT * r1) \ VEC_TYPE mx; \ VEC_INT_TYPE mr, mr1; \ INIT_VEC_LOOP (mx, x, VEC_LEN); \ - INIT_VEC_PTRS_LOOP (((FLOAT **) &mr), r_loc, VEC_LEN); \ - INIT_VEC_PTRS_LOOP (((FLOAT **) &mr1), r1_loc, VEC_LEN); \ + INIT_VEC_PTRS_LOOP (mr, r_loc, VEC_LEN); \ + INIT_VEC_PTRS_LOOP (mr1, r1_loc, VEC_LEN); \ vector_func (mx, mr, mr1); \ TEST_VEC_LOOP (r_loc, VEC_LEN); \ TEST_VEC_LOOP (r1_loc, VEC_LEN); \ @@ -63,8 +63,8 @@ void scalar_func (FLOAT x, FLOAT * r, FLOAT * r1) \ VEC_TYPE mx; \ VEC_INT_TYPE mr, mr1; \ INIT_VEC_LOOP (mx, x, VEC_LEN); \ - INIT_VEC_PTRS_LOOP (((FLOAT **) &mr), r_loc, VEC_LEN/2); \ - INIT_VEC_PTRS_LOOP (((FLOAT **) &mr1), r1_loc, VEC_LEN/2); \ + INIT_VEC_PTRS_LOOP (mr, r_loc, VEC_LEN/2); \ + INIT_VEC_PTRS_LOOP (mr1, r1_loc, VEC_LEN/2); \ vector_func (mx, mr, mr, mr1, mr1); \ TEST_VEC_LOOP (r_loc, VEC_LEN/2); \ TEST_VEC_LOOP (r1_loc, VEC_LEN/2); \ @@ -87,8 +87,8 @@ void scalar_func (FLOAT x, FLOAT * r, FLOAT * r1) \ VEC_TYPE mx; \ VEC_INT_TYPE mr, mr1; \ INIT_VEC_LOOP (mx, x, VEC_LEN); \ - INIT_VEC_PTRS_LOOP (((FLOAT **) &mr), r_loc, VEC_LEN/4); \ - INIT_VEC_PTRS_LOOP (((FLOAT **) &mr1), r1_loc, VEC_LEN/4); \ + INIT_VEC_PTRS_LOOP (mr, r_loc, VEC_LEN/4); \ + INIT_VEC_PTRS_LOOP (mr1, r1_loc, VEC_LEN/4); \ vector_func (mx, mr, mr, mr, mr, mr1, mr1, mr1, mr1); \ TEST_VEC_LOOP (r_loc, VEC_LEN/4); \ TEST_VEC_LOOP (r1_loc, VEC_LEN/4); \ -- cgit 1.4.1