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i < n; i++) a[i] = b[i]; } now generates: .L4: ldp q0, q1, [x3] add x3, x3, 32 uzp1 v0.8h, v0.8h, v1.8h str q0, [x5], 16 cmp x4, x3 bne .L4 instead of .L4: ldp q0, q1, [x3] add x3, x3, 32 xtn v0.4h, v0.4s xtn2 v0.8h, v1.4s str q0, [x5], 16 cmp x4, x3 bne .L4 Bootstrapped Regtested on aarch64-none-linux-gnu and no issues. Ok for master? Thanks, Tamar gcc/ChangeLog: * config/aarch64/aarch64-simd.md (*aarch64_narrow_trunc): New. * config/aarch64/iterators.md (VNARROWSIMD, Vnarrowsimd): New. gcc/testsuite/ChangeLog: * gcc.target/aarch64/xtn-combine-1.c: New test. * gcc.target/aarch64/narrow_high_combine.c: Update case. --- inline copy of patch -- diff --git a/gcc/config/aarch64/aarch64-simd.md b/gcc/config/aarch64/aarch64-simd.md index 36396ef236e8c476d5e2f1acee80dc54ec5ebe4e..33e3301d229366022a5b9481b6c3ae8f8d93f9e2 100644 diff --git a/gcc/config/aarch64/aarch64-simd.md b/gcc/config/aarch64/aarch64-simd.md index 36396ef236e8c476d5e2f1acee80dc54ec5ebe4e..33e3301d229366022a5b9481b6c3ae8f8d93f9e2 100644 --- a/gcc/config/aarch64/aarch64-simd.md +++ b/gcc/config/aarch64/aarch64-simd.md @@ -1753,6 +1753,18 @@ (define_expand "aarch64_xtn2" } ) +(define_insn "*aarch64_narrow_trunc" + [(set (match_operand: 0 "register_operand" "=w") + (vec_concat: + (truncate: + (match_operand:VQN 1 "register_operand" "w")) + (truncate: + (match_operand:VQN 2 "register_operand" "w"))))] + "TARGET_SIMD" + "uzp1\\t%0., %1., %2." + [(set_attr "type" "neon_permute")] +) + ;; Packing doubles. (define_expand "vec_pack_trunc_" diff --git a/gcc/config/aarch64/iterators.md b/gcc/config/aarch64/iterators.md index 8dbeed3b0d4a44cdc17dd333ed397b39a33f386a..95b385c0c9405fe95fcd07262a9471ab13d5488e 100644 --- a/gcc/config/aarch64/iterators.md +++ b/gcc/config/aarch64/iterators.md @@ -270,6 +270,14 @@ (define_mode_iterator VDQHS [V4HI V8HI V2SI V4SI]) ;; Advanced SIMD modes for H, S and D types. (define_mode_iterator VDQHSD [V4HI V8HI V2SI V4SI V2DI]) +;; Modes for which we can narrow the element and increase the lane counts +;; to preserve the same register size. +(define_mode_attr VNARROWSIMD [(V4HI "V8QI") (V8HI "V16QI") (V4SI "V8HI") + (V2SI "V4HI") (V2DI "V4SI")]) + +(define_mode_attr Vnarrowsimd [(V4HI "v8qi") (V8HI "v16qi") (V4SI "v8hi") + (V2SI "v4hi") (V2DI "v4si")]) + ;; Advanced SIMD and scalar integer modes for H and S. (define_mode_iterator VSDQ_HSI [V4HI V8HI V2SI V4SI HI SI]) diff --git a/gcc/testsuite/gcc.target/aarch64/narrow_high_combine.c b/gcc/testsuite/gcc.target/aarch64/narrow_high_combine.c index 50ecab002a3552d37a5cc0d8921f42f6c3dba195..fa61196d3644caa48b12151e12b15dfeab8c7e71 100644 --- a/gcc/testsuite/gcc.target/aarch64/narrow_high_combine.c +++ b/gcc/testsuite/gcc.target/aarch64/narrow_high_combine.c @@ -225,7 +225,8 @@ TEST_2_UNARY (vqmovun, uint32x4_t, int64x2_t, s64, u32) /* { dg-final { scan-assembler-times "\\tuqshrn2\\tv" 6} } */ /* { dg-final { scan-assembler-times "\\tsqrshrn2\\tv" 6} } */ /* { dg-final { scan-assembler-times "\\tuqrshrn2\\tv" 6} } */ -/* { dg-final { scan-assembler-times "\\txtn2\\tv" 12} } */ +/* { dg-final { scan-assembler-times "\\txtn2\\tv" 6} } */ +/* { dg-final { scan-assembler-times "\\tuzp1\\tv" 6} } */ /* { dg-final { scan-assembler-times "\\tuqxtn2\\tv" 6} } */ /* { dg-final { scan-assembler-times "\\tsqxtn2\\tv" 6} } */ /* { dg-final { scan-assembler-times "\\tsqxtun2\\tv" 6} } */ diff --git a/gcc/testsuite/gcc.target/aarch64/xtn-combine-1.c b/gcc/testsuite/gcc.target/aarch64/xtn-combine-1.c new file mode 100644 index 0000000000000000000000000000000000000000..ed655cc970a602da4ace78dc8dbd64ab18b0d4ab --- /dev/null +++ b/gcc/testsuite/gcc.target/aarch64/xtn-combine-1.c @@ -0,0 +1,12 @@ +/* { dg-do assemble } */ +/* { dg-options "-O3 --save-temps --param=vect-epilogues-nomask=0" } */ + +void d2 (short * restrict a, int *b, int n) +{ + for (int i = 0; i < n; i++) + a[i] = b[i]; +} + +/* { dg-final { scan-assembler-times {\tuzp1\t} 1 } } */ +/* { dg-final { scan-assembler-not {\txtn\t} } } */ +/* { dg-final { scan-assembler-not {\txtn2\t} } } */