Hi,
Currently move_max follows the tuning feature first, but ideally it
should sync with prefer-vector-width when it is explicitly set to keep
vector move and operation with same vector size.
Bootstrapped/regtested on x86-64-pc-linux-gnu{-m32,}
OK for trunk?
gcc/ChangeLog:
PR target/112824
* config/i386/i386-options.cc (ix86_option_override_internal):
Sync ix86_move_max/ix86_store_max with prefer_vector_width when
it is explicitly set.
gcc/testsuite/ChangeLog:
PR target/112824
* gcc.target/i386/pieces-memset-45.c: Remove
-mprefer-vector-width=256.
* g++.target/i386/pr112824-1.C: New test.
---
gcc/config/i386/i386-options.cc | 8 +-
gcc/testsuite/g++.target/i386/pr112824-1.C | 113 ++++++++++++++++++
.../gcc.target/i386/pieces-memset-45.c | 2 +-
3 files changed, 120 insertions(+), 3 deletions(-)
create mode 100644 gcc/testsuite/g++.target/i386/pr112824-1.C
diff --git a/gcc/config/i386/i386-options.cc b/gcc/config/i386/i386-options.cc
index 588a0878c0d..440ef59ffff 100644
--- a/gcc/config/i386/i386-options.cc
+++ b/gcc/config/i386/i386-options.cc
@@ -3012,7 +3012,9 @@ ix86_option_override_internal (bool main_args_p,
{
/* Set the maximum number of bits can be moved from memory to
memory efficiently. */
- if (ix86_tune_features[X86_TUNE_AVX512_MOVE_BY_PIECES])
+ if (opts_set->x_prefer_vector_width_type != PVW_NONE)
+ opts->x_ix86_move_max = opts->x_prefer_vector_width_type;
+ else if (ix86_tune_features[X86_TUNE_AVX512_MOVE_BY_PIECES])
opts->x_ix86_move_max = PVW_AVX512;
else if (ix86_tune_features[X86_TUNE_AVX256_MOVE_BY_PIECES])
opts->x_ix86_move_max = PVW_AVX256;
@@ -3034,7 +3036,9 @@ ix86_option_override_internal (bool main_args_p,
{
/* Set the maximum number of bits can be stored to memory
efficiently. */
- if (ix86_tune_features[X86_TUNE_AVX512_STORE_BY_PIECES])
+ if (opts_set->x_prefer_vector_width_type != PVW_NONE)
+ opts->x_ix86_store_max = opts->x_prefer_vector_width_type;
+ else if (ix86_tune_features[X86_TUNE_AVX512_STORE_BY_PIECES])
opts->x_ix86_store_max = PVW_AVX512;
else if (ix86_tune_features[X86_TUNE_AVX256_STORE_BY_PIECES])
opts->x_ix86_store_max = PVW_AVX256;
diff --git a/gcc/testsuite/g++.target/i386/pr112824-1.C
b/gcc/testsuite/g++.target/i386/pr112824-1.C
new file mode 100644
index 00000000000..fccaf23c530
--- /dev/null
+++ b/gcc/testsuite/g++.target/i386/pr112824-1.C
@@ -0,0 +1,113 @@
+/* PR target/112824 */
+/* { dg-do compile } */
+/* { dg-options "-std=c++23 -O3 -march=skylake-avx512
-mprefer-vector-width=512" } */
+/* { dg-final { scan-assembler-not "vmov(?:dqu|apd)\[ \\t\]+\[^\n\]*%ymm" } }
*/
+
+
+#include <bit>
+#include <concepts>
+#include <cstddef>
+#include <cstdint>
+
+template <ptrdiff_t W, typename T>
+using Vec [[gnu::vector_size(W * sizeof(T))]] = T;
+
+// Omitted: 16 without AVX, 32 without AVX512F,
+// or for forward compatibility some AVX10 may also mean 32-only
+static constexpr ptrdiff_t VectorBytes = 64;
+template<typename T>
+static constexpr ptrdiff_t VecWidth = 64 <= sizeof(T) ? 1 : 64/sizeof(T);
+
+template <typename T, ptrdiff_t N> struct Vector{
+ static constexpr ptrdiff_t L = N;
+ T data[L];
+ static constexpr auto size()->ptrdiff_t{return N;}
+};
+template <std::floating_point T, ptrdiff_t N> struct Vector<T,N>{
+ static constexpr ptrdiff_t W = N >= VecWidth<T> ? VecWidth<T> :
ptrdiff_t(std::bit_ceil(size_t(N)));
+ static constexpr ptrdiff_t L = (N/W) + ((N%W)!=0);
+ using V = Vec<W,T>;
+ V data[L];
+ static constexpr auto size()->ptrdiff_t{return N;}
+};
+/// should be trivially copyable
+/// codegen is worse when passing by value, even though it seems like it
should make
+/// aliasing simpler to analyze?
+template<typename T, ptrdiff_t N>
+[[gnu::always_inline]] constexpr auto operator+(Vector<T,N> x, Vector<T,N> y)
-> Vector<T,N> {
+ Vector<T,N> z;
+ for (ptrdiff_t n = 0; n < Vector<T,N>::L; ++n) z.data[n] = x.data[n] +
y.data[n];
+ return z;
+}
+template<typename T, ptrdiff_t N>
+[[gnu::always_inline]] constexpr auto operator*(Vector<T,N> x, Vector<T,N> y)
-> Vector<T,N> {
+ Vector<T,N> z;
+ for (ptrdiff_t n = 0; n < Vector<T,N>::L; ++n) z.data[n] = x.data[n] *
y.data[n];
+ return z;
+}
+template<typename T, ptrdiff_t N>
+[[gnu::always_inline]] constexpr auto operator+(T x, Vector<T,N> y) ->
Vector<T,N> {
+ Vector<T,N> z;
+ for (ptrdiff_t n = 0; n < Vector<T,N>::L; ++n) z.data[n] = x + y.data[n];
+ return z;
+}
+template<typename T, ptrdiff_t N>
+[[gnu::always_inline]] constexpr auto operator*(T x, Vector<T,N> y) ->
Vector<T,N> {
+ Vector<T,N> z;
+ for (ptrdiff_t n = 0; n < Vector<T,N>::L; ++n) z.data[n] = x * y.data[n];
+ return z;
+}
+
+
+
+template <typename T, ptrdiff_t N> struct Dual {
+ T value;
+ Vector<T, N> partials;
+};
+// Here we have a specialization for non-power-of-2 `N`
+template <typename T, ptrdiff_t N>
+requires(std::floating_point<T> && (std::popcount(size_t(N))>1))
+struct Dual<T,N> {
+ Vector<T, N+1> data;
+};
+
+template<ptrdiff_t W, typename T>
+consteval auto firstoff(){
+ static_assert(std::same_as<T,double>, "type not implemented");
+ if constexpr (W==2) return Vec<2,int64_t>{0,1} != 0;
+ else if constexpr (W == 4) return Vec<4,int64_t>{0,1,2,3} != 0;
+ else if constexpr (W == 8) return Vec<8,int64_t>{0,1,2,3,4,5,6,7} != 0;
+ else static_assert(false, "vector width not implemented");
+}
+
+template <typename T, ptrdiff_t N>
+[[gnu::always_inline]] constexpr auto operator+(Dual<T, N> a,
+ Dual<T, N> b)
+ -> Dual<T, N> {
+ if constexpr (std::floating_point<T> && (std::popcount(size_t(N))>1)){
+ Dual<T,N> c;
+ for (ptrdiff_t l = 0; l < Vector<T,N>::L; ++l)
+ c.data.data[l] = a.data.data[l] + b.data.data[l];
+ return c;
+ } else return {a.value + b.value, a.partials + b.partials};
+}
+
+template <typename T, ptrdiff_t N>
+[[gnu::always_inline]] constexpr auto operator*(Dual<T, N> a,
+ Dual<T, N> b)
+ -> Dual<T, N> {
+ if constexpr (std::floating_point<T> && (std::popcount(size_t(N))>1)){
+ using V = typename Vector<T,N>::V;
+ V va = V{}+a.data.data[0][0], vb = V{}+b.data.data[0][0];
+ V x = va * b.data.data[0];
+ Dual<T,N> c;
+ c.data.data[0] = firstoff<Vector<T,N>::W,T>() ? x + vb*a.data.data[0] : x;
+ for (ptrdiff_t l = 1; l < Vector<T,N>::L; ++l)
+ c.data.data[l] = va*b.data.data[l] + vb*a.data.data[l];
+ return c;
+ } else return {a.value * b.value, a.value * b.partials + b.value *
a.partials};
+}
+
+void prod(Dual<Dual<double,7>,2> &c, const Dual<Dual<double,7>,2> &a, const
Dual<Dual<double,7>,2>&b){
+ c = a*b;
+}
diff --git a/gcc/testsuite/gcc.target/i386/pieces-memset-45.c
b/gcc/testsuite/gcc.target/i386/pieces-memset-45.c
index 70c80e5064b..e8ce7c23256 100644
--- a/gcc/testsuite/gcc.target/i386/pieces-memset-45.c
+++ b/gcc/testsuite/gcc.target/i386/pieces-memset-45.c
@@ -1,5 +1,5 @@
/* { dg-do compile } */
-/* { dg-options "-O2 -march=x86-64 -mprefer-vector-width=256 -mavx512f
-mtune-ctrl=avx512_store_by_pieces" } */
+/* { dg-options "-O2 -march=x86-64 -mavx512f
-mtune-ctrl=avx512_store_by_pieces" } */
extern char *dst;
--
2.31.1
