From: Kyrylo Tkachov Date: Tue, 4 Jul 2017 15:19:30 +0000 (+0000) Subject: [AArch64] Fix strict aliasing issue in gcc.target/aarch64/simd/vminmaxnm_1.c X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a4187dab5248cb42781fa6b2f57b95214c4f8b03;p=gcc.git [AArch64] Fix strict aliasing issue in gcc.target/aarch64/simd/vminmaxnm_1.c While doing some unrelated work the gcc.target/aarch64/simd/vminmaxnm_1.c testcase started failing for me. Upon investigation it turns out that it breaks the C strict aliasing rules in the CHECK macro by casting a pointer to an incompatible type and dereferencing it. GCC even warns about it if compiled with -Wstrict-aliasing. This patch fixes the testcase by making it use memcmp to compare the vector elements. This avoids the undefined behaviour. The testcase still passes on trunk. * gcc.target/aarch64/simd/vminmaxnm_1.c: Fix strict aliasing issues. From-SVN: r249972 --- diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 93926b28454..f1fbe61d131 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,7 @@ +2017-07-04 Kyrylo Tkachov + + * gcc.target/aarch64/simd/vminmaxnm_1.c: Fix strict aliasing issues. + 2017-07-04 Marek Polacek PR c/81231 diff --git a/gcc/testsuite/gcc.target/aarch64/simd/vminmaxnm_1.c b/gcc/testsuite/gcc.target/aarch64/simd/vminmaxnm_1.c index 192bad9879b..8fd428115ba 100644 --- a/gcc/testsuite/gcc.target/aarch64/simd/vminmaxnm_1.c +++ b/gcc/testsuite/gcc.target/aarch64/simd/vminmaxnm_1.c @@ -7,12 +7,10 @@ extern void abort (); -#define CHECK(T, N, R, E) \ +#define CHECK(R, E) \ {\ - int i = 0;\ - for (; i < N; i++)\ - if (* (T *) &R[i] != * (T *) &E[i])\ - abort ();\ + if (__builtin_memcmp (&R, &E, sizeof (R)) != 0)\ + abort ();\ } int @@ -26,8 +24,8 @@ main (int argc, char **argv) float32x2_t f32x2_ret_minnm = vminnm_f32 (f32x2_input1, f32x2_input2); float32x2_t f32x2_ret_maxnm = vmaxnm_f32 (f32x2_input1, f32x2_input2); - CHECK (uint32_t, 2, f32x2_ret_minnm, f32x2_exp_minnm); - CHECK (uint32_t, 2, f32x2_ret_maxnm, f32x2_exp_maxnm); + CHECK (f32x2_ret_minnm, f32x2_exp_minnm); + CHECK (f32x2_ret_maxnm, f32x2_exp_maxnm); /* v{min|max}nm_f32 NaN. */ f32x2_input1 = vdup_n_f32 (__builtin_nanf ("")); @@ -37,8 +35,8 @@ main (int argc, char **argv) f32x2_ret_minnm = vminnm_f32 (f32x2_input1, f32x2_input2); f32x2_ret_maxnm = vmaxnm_f32 (f32x2_input1, f32x2_input2); - CHECK (uint32_t, 2, f32x2_ret_minnm, f32x2_exp_minnm); - CHECK (uint32_t, 2, f32x2_ret_maxnm, f32x2_exp_maxnm); + CHECK (f32x2_ret_minnm, f32x2_exp_minnm); + CHECK (f32x2_ret_maxnm, f32x2_exp_maxnm); /* v{min|max}nmq_f32 normal. */ float32x4_t f32x4_input1 = vdupq_n_f32 (-1024.0); @@ -48,8 +46,8 @@ main (int argc, char **argv) float32x4_t f32x4_ret_minnm = vminnmq_f32 (f32x4_input1, f32x4_input2); float32x4_t f32x4_ret_maxnm = vmaxnmq_f32 (f32x4_input1, f32x4_input2); - CHECK (uint32_t, 4, f32x4_ret_minnm, f32x4_exp_minnm); - CHECK (uint32_t, 4, f32x4_ret_maxnm, f32x4_exp_maxnm); + CHECK (f32x4_ret_minnm, f32x4_exp_minnm); + CHECK (f32x4_ret_maxnm, f32x4_exp_maxnm); /* v{min|max}nmq_f32 NaN. */ f32x4_input1 = vdupq_n_f32 (-__builtin_nanf ("")); @@ -59,8 +57,8 @@ main (int argc, char **argv) f32x4_ret_minnm = vminnmq_f32 (f32x4_input1, f32x4_input2); f32x4_ret_maxnm = vmaxnmq_f32 (f32x4_input1, f32x4_input2); - CHECK (uint32_t, 4, f32x4_ret_minnm, f32x4_exp_minnm); - CHECK (uint32_t, 4, f32x4_ret_maxnm, f32x4_exp_maxnm); + CHECK (f32x4_ret_minnm, f32x4_exp_minnm); + CHECK (f32x4_ret_maxnm, f32x4_exp_maxnm); /* v{min|max}nm_f64 normal. */ float64x1_t f64x1_input1 = vdup_n_f64 (1.23); @@ -69,16 +67,16 @@ main (int argc, char **argv) float64x1_t f64x1_exp_maxnm = vdup_n_f64 (4.56); float64x1_t f64x1_ret_minnm = vminnm_f64 (f64x1_input1, f64x1_input2); float64x1_t f64x1_ret_maxnm = vmaxnm_f64 (f64x1_input1, f64x1_input2); - CHECK (uint64_t, 1, f64x1_ret_minnm, f64x1_exp_minnm); - CHECK (uint64_t, 1, f64x1_ret_maxnm, f64x1_exp_maxnm); + CHECK (f64x1_ret_minnm, f64x1_exp_minnm); + CHECK (f64x1_ret_maxnm, f64x1_exp_maxnm); /* v{min|max}_f64 normal. */ float64x1_t f64x1_exp_min = vdup_n_f64 (1.23); float64x1_t f64x1_exp_max = vdup_n_f64 (4.56); float64x1_t f64x1_ret_min = vmin_f64 (f64x1_input1, f64x1_input2); float64x1_t f64x1_ret_max = vmax_f64 (f64x1_input1, f64x1_input2); - CHECK (uint64_t, 1, f64x1_ret_min, f64x1_exp_min); - CHECK (uint64_t, 1, f64x1_ret_max, f64x1_exp_max); + CHECK (f64x1_ret_min, f64x1_exp_min); + CHECK (f64x1_ret_max, f64x1_exp_max); /* v{min|max}nmq_f64 normal. */ float64x2_t f64x2_input1 = vdupq_n_f64 (1.23); @@ -87,8 +85,8 @@ main (int argc, char **argv) float64x2_t f64x2_exp_maxnm = vdupq_n_f64 (4.56); float64x2_t f64x2_ret_minnm = vminnmq_f64 (f64x2_input1, f64x2_input2); float64x2_t f64x2_ret_maxnm = vmaxnmq_f64 (f64x2_input1, f64x2_input2); - CHECK (uint64_t, 2, f64x2_ret_minnm, f64x2_exp_minnm); - CHECK (uint64_t, 2, f64x2_ret_maxnm, f64x2_exp_maxnm); + CHECK (f64x2_ret_minnm, f64x2_exp_minnm); + CHECK (f64x2_ret_maxnm, f64x2_exp_maxnm); /* v{min|max}nm_f64 NaN. */ f64x1_input1 = vdup_n_f64 (-__builtin_nanf ("")); @@ -98,8 +96,8 @@ main (int argc, char **argv) f64x1_ret_minnm = vminnm_f64 (f64x1_input1, f64x1_input2); f64x1_ret_maxnm = vmaxnm_f64 (f64x1_input1, f64x1_input2); - CHECK (uint64_t, 1, f64x1_ret_minnm, f64x1_exp_minnm); - CHECK (uint64_t, 1, f64x1_ret_maxnm, f64x1_exp_maxnm); + CHECK (f64x1_ret_minnm, f64x1_exp_minnm); + CHECK (f64x1_ret_maxnm, f64x1_exp_maxnm); /* v{min|max}_f64 NaN. */ f64x1_input1 = vdup_n_f64 (-__builtin_nanf ("")); @@ -109,8 +107,8 @@ main (int argc, char **argv) f64x1_ret_minnm = vmin_f64 (f64x1_input1, f64x1_input2); f64x1_ret_maxnm = vmax_f64 (f64x1_input1, f64x1_input2); - CHECK (uint64_t, 1, f64x1_ret_minnm, f64x1_exp_minnm); - CHECK (uint64_t, 1, f64x1_ret_maxnm, f64x1_exp_maxnm); + CHECK (f64x1_ret_minnm, f64x1_exp_minnm); + CHECK (f64x1_ret_maxnm, f64x1_exp_maxnm); /* v{min|max}nmq_f64 NaN. */ f64x2_input1 = vdupq_n_f64 (-__builtin_nan ("")); @@ -120,8 +118,8 @@ main (int argc, char **argv) f64x2_ret_minnm = vminnmq_f64 (f64x2_input1, f64x2_input2); f64x2_ret_maxnm = vmaxnmq_f64 (f64x2_input1, f64x2_input2); - CHECK (uint64_t, 2, f64x2_ret_minnm, f64x2_exp_minnm); - CHECK (uint64_t, 2, f64x2_ret_maxnm, f64x2_exp_maxnm); + CHECK (f64x2_ret_minnm, f64x2_exp_minnm); + CHECK (f64x2_ret_maxnm, f64x2_exp_maxnm); return 0; }