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* [gcc r12-7818] arm: Revert Auto-vectorization for MVE: add pack/unpack patterns PR target/104882
@ 2022-03-25 17:27 Christophe Lyon
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From: Christophe Lyon @ 2022-03-25 17:27 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:3ab5c8cd03d92bf4ec41e351820349d92fbc40c4
commit r12-7818-g3ab5c8cd03d92bf4ec41e351820349d92fbc40c4
Author: Christophe Lyon <christophe.lyon@arm.com>
Date: Fri Mar 18 08:30:00 2022 +0000
arm: Revert Auto-vectorization for MVE: add pack/unpack patterns PR target/104882
This reverts commit r12-1434-g046a3beb1673bf to fix PR target/104882.
As discussed in the PR, it turns out that the MVE ISA has no natural
mapping with GCC's vec_pack_trunc / vec_unpack standard patterns, unlike
Neon or SVE for instance.
This patch also adds the executable testcase provided in the PR.
This test passes at -O3 because the generated code does not need
to use the pack/unpack patterns, hence the use of -O2 which now
triggers vectorization since a few months ago.
2022-03-18 Christophe Lyon <christohe.lyon@arm.com>
PR target/104882
Revert
2021-06-11 Christophe Lyon <christophe.lyon@linaro.org>
gcc/
* config/arm/mve.md (mve_vec_unpack<US>_lo_<mode>): Delete.
(mve_vec_unpack<US>_hi_<mode>): Delete.
(@mve_vec_pack_trunc_lo_<mode>): Delete.
(mve_vmovntq_<supf><mode>): Remove '@' prefix.
* config/arm/neon.md (vec_unpack<US>_hi_<mode>): Move back
from vec-common.md.
(vec_unpack<US>_lo_<mode>): Likewise.
(vec_pack_trunc_<mode>): Rename from
neon_quad_vec_pack_trunc_<mode>.
* config/arm/vec-common.md (vec_unpack<US>_hi_<mode>): Delete.
(vec_unpack<US>_lo_<mode>): Delete.
(vec_pack_trunc_<mode>): Delete.
PR target/104882
gcc/testsuite/
* gcc.target/arm/simd/mve-vclz.c: Update expected results.
* gcc.target/arm/simd/mve-vshl.c: Likewise.
* gcc.target/arm/simd/mve-vec-pack.c: Delete.
* gcc.target/arm/simd/mve-vec-unpack.c: Delete.
* gcc.target/arm/simd/pr104882.c: New test.
Diff:
---
gcc/config/arm/mve.md | 35 +----------
gcc/config/arm/neon.md | 39 +++++++++++-
gcc/config/arm/vec-common.md | 71 ----------------------
gcc/testsuite/gcc.target/arm/simd/mve-vclz.c | 7 +--
gcc/testsuite/gcc.target/arm/simd/mve-vec-pack.c | 26 --------
gcc/testsuite/gcc.target/arm/simd/mve-vec-unpack.c | 29 ---------
gcc/testsuite/gcc.target/arm/simd/mve-vshl.c | 5 +-
gcc/testsuite/gcc.target/arm/simd/pr104882.c | 16 +++++
8 files changed, 59 insertions(+), 169 deletions(-)
diff --git a/gcc/config/arm/mve.md b/gcc/config/arm/mve.md
index 908bedc9254..369d7a79f6c 100644
--- a/gcc/config/arm/mve.md
+++ b/gcc/config/arm/mve.md
@@ -535,26 +535,6 @@
[(set_attr "type" "mve_move")
])
-(define_insn "mve_vec_unpack<US>_lo_<mode>"
- [(set (match_operand:<V_unpack> 0 "register_operand" "=w")
- (SE:<V_unpack> (vec_select:<V_HALF>
- (match_operand:MVE_3 1 "register_operand" "w")
- (match_operand:MVE_3 2 "vect_par_constant_low" ""))))]
- "TARGET_HAVE_MVE"
- "vmovlb.<US>%#<V_sz_elem> %q0, %q1"
- [(set_attr "type" "mve_move")]
-)
-
-(define_insn "mve_vec_unpack<US>_hi_<mode>"
- [(set (match_operand:<V_unpack> 0 "register_operand" "=w")
- (SE:<V_unpack> (vec_select:<V_HALF>
- (match_operand:MVE_3 1 "register_operand" "w")
- (match_operand:MVE_3 2 "vect_par_constant_high" ""))))]
- "TARGET_HAVE_MVE"
- "vmovlt.<US>%#<V_sz_elem> %q0, %q1"
- [(set_attr "type" "mve_move")]
-)
-
;;
;; [vcvtpq_s, vcvtpq_u])
;;
@@ -2219,23 +2199,10 @@
[(set_attr "type" "mve_move")
])
-;; vmovnb pattern used by the vec_pack_trunc expander to avoid the
-;; need for an uninitialized input operand.
-(define_insn "@mve_vec_pack_trunc_lo_<mode>"
- [
- (set (match_operand:<V_narrow_pack> 0 "s_register_operand" "=w")
- (unspec:<V_narrow_pack> [(match_operand:MVE_5 1 "s_register_operand" "w")]
- VMOVNBQ_S))
- ]
- "TARGET_HAVE_MVE"
- "vmovnb.i%#<V_sz_elem> %q0, %q1"
- [(set_attr "type" "mve_move")
-])
-
;;
;; [vmovntq_s, vmovntq_u])
;;
-(define_insn "@mve_vmovntq_<supf><mode>"
+(define_insn "mve_vmovntq_<supf><mode>"
[
(set (match_operand:<V_narrow_pack> 0 "s_register_operand" "=w")
(unspec:<V_narrow_pack> [(match_operand:<V_narrow_pack> 1 "s_register_operand" "0")
diff --git a/gcc/config/arm/neon.md b/gcc/config/arm/neon.md
index f270ded4978..275bcc1435e 100644
--- a/gcc/config/arm/neon.md
+++ b/gcc/config/arm/neon.md
@@ -6005,6 +6005,43 @@ if (BYTES_BIG_ENDIAN)
[(set_attr "type" "neon_shift_imm_long")]
)
+(define_expand "vec_unpack<US>_hi_<mode>"
+ [(match_operand:<V_unpack> 0 "register_operand")
+ (SE:<V_unpack> (match_operand:VU 1 "register_operand"))]
+ "TARGET_NEON && !BYTES_BIG_ENDIAN"
+ {
+ rtvec v = rtvec_alloc (<V_mode_nunits>/2) ;
+ rtx t1;
+ int i;
+ for (i = 0; i < (<V_mode_nunits>/2); i++)
+ RTVEC_ELT (v, i) = GEN_INT ((<V_mode_nunits>/2) + i);
+
+ t1 = gen_rtx_PARALLEL (<MODE>mode, v);
+ emit_insn (gen_neon_vec_unpack<US>_hi_<mode> (operands[0],
+ operands[1],
+ t1));
+ DONE;
+ }
+)
+
+(define_expand "vec_unpack<US>_lo_<mode>"
+ [(match_operand:<V_unpack> 0 "register_operand")
+ (SE:<V_unpack> (match_operand:VU 1 "register_operand"))]
+ "TARGET_NEON && !BYTES_BIG_ENDIAN"
+ {
+ rtvec v = rtvec_alloc (<V_mode_nunits>/2) ;
+ rtx t1;
+ int i;
+ for (i = 0; i < (<V_mode_nunits>/2) ; i++)
+ RTVEC_ELT (v, i) = GEN_INT (i);
+ t1 = gen_rtx_PARALLEL (<MODE>mode, v);
+ emit_insn (gen_neon_vec_unpack<US>_lo_<mode> (operands[0],
+ operands[1],
+ t1));
+ DONE;
+ }
+)
+
(define_insn "neon_vec_<US>mult_lo_<mode>"
[(set (match_operand:<V_unpack> 0 "register_operand" "=w")
(mult:<V_unpack> (SE:<V_unpack> (vec_select:<V_HALF>
@@ -6220,7 +6257,7 @@ if (BYTES_BIG_ENDIAN)
; because the ordering of vector elements in Q registers is different from what
; the semantics of the instructions require.
-(define_insn "neon_quad_vec_pack_trunc_<mode>"
+(define_insn "vec_pack_trunc_<mode>"
[(set (match_operand:<V_narrow_pack> 0 "register_operand" "=&w")
(vec_concat:<V_narrow_pack>
(truncate:<V_narrow>
diff --git a/gcc/config/arm/vec-common.md b/gcc/config/arm/vec-common.md
index f13009090af..fd878cba22d 100644
--- a/gcc/config/arm/vec-common.md
+++ b/gcc/config/arm/vec-common.md
@@ -580,77 +580,6 @@
"ARM_HAVE_<MODE>_ARITH
&& !TARGET_REALLY_IWMMXT"
)
-
-;; vmovl[tb] are not available for V4SI on MVE
-(define_expand "vec_unpack<US>_hi_<mode>"
- [(set (match_operand:<V_unpack> 0 "register_operand")
- (SE:<V_unpack> (vec_select:<V_HALF>
- (match_operand:VU 1 "register_operand")
- (match_dup 2))))]
- "ARM_HAVE_<MODE>_ARITH
- && !TARGET_REALLY_IWMMXT
- && ! (<MODE>mode == V4SImode && TARGET_HAVE_MVE)
- && !BYTES_BIG_ENDIAN"
- {
- rtvec v = rtvec_alloc (<V_mode_nunits>/2);
- int i;
- for (i = 0; i < (<V_mode_nunits>/2); i++)
- RTVEC_ELT (v, i) = GEN_INT ((<V_mode_nunits>/2) + i);
-
- operands[2] = gen_rtx_PARALLEL (<MODE>mode, v);
- }
-)
-
-;; vmovl[tb] are not available for V4SI on MVE
-(define_expand "vec_unpack<US>_lo_<mode>"
- [(set (match_operand:<V_unpack> 0 "register_operand")
- (SE:<V_unpack> (vec_select:<V_HALF>
- (match_operand:VU 1 "register_operand")
- (match_dup 2))))]
- "ARM_HAVE_<MODE>_ARITH
- && !TARGET_REALLY_IWMMXT
- && ! (<MODE>mode == V4SImode && TARGET_HAVE_MVE)
- && !BYTES_BIG_ENDIAN"
- {
- rtvec v = rtvec_alloc (<V_mode_nunits>/2);
- int i;
- for (i = 0; i < (<V_mode_nunits>/2) ; i++)
- RTVEC_ELT (v, i) = GEN_INT (i);
-
- operands[2] = gen_rtx_PARALLEL (<MODE>mode, v);
-
- }
-)
-
-;; vmovn[tb] are not available for V2DI on MVE
-(define_expand "vec_pack_trunc_<mode>"
- [(set (match_operand:<V_narrow_pack> 0 "register_operand")
- (vec_concat:<V_narrow_pack>
- (truncate:<V_narrow>
- (match_operand:VN 1 "register_operand"))
- (truncate:<V_narrow>
- (match_operand:VN 2 "register_operand"))))]
- "ARM_HAVE_<MODE>_ARITH
- && !TARGET_REALLY_IWMMXT
- && ! (<MODE>mode == V2DImode && TARGET_HAVE_MVE)
- && !BYTES_BIG_ENDIAN"
- {
- if (TARGET_NEON)
- {
- emit_insn (gen_neon_quad_vec_pack_trunc_<mode> (operands[0], operands[1],
- operands[2]));
- }
- else
- {
- rtx tmpreg = gen_reg_rtx (<V_narrow_pack>mode);
- emit_insn (gen_mve_vec_pack_trunc_lo (<MODE>mode, tmpreg, operands[1]));
- emit_insn (gen_mve_vmovntq (VMOVNTQ_S, <MODE>mode,
- operands[0], tmpreg, operands[2]));
- }
- DONE;
- }
-)
-
(define_expand "vec_init<mode><V_elem_l>"
[(match_operand:VDQX 0 "s_register_operand")
(match_operand 1 "" "")]
diff --git a/gcc/testsuite/gcc.target/arm/simd/mve-vclz.c b/gcc/testsuite/gcc.target/arm/simd/mve-vclz.c
index 5d6e991cfc6..7068736bc28 100644
--- a/gcc/testsuite/gcc.target/arm/simd/mve-vclz.c
+++ b/gcc/testsuite/gcc.target/arm/simd/mve-vclz.c
@@ -21,9 +21,8 @@ FUNC(u, uint, 16, clz)
FUNC(s, int, 8, clz)
FUNC(u, uint, 8, clz)
-/* 16 and 8-bit versions still use 32-bit intermediate temporaries, so for
- instance instead of using vclz.i8, we need 4 vclz.i32, leading to a total of
- 14 vclz.i32 expected in this testcase. */
-/* { dg-final { scan-assembler-times {vclz\.i32 q[0-9]+, q[0-9]+} 14 } } */
+/* 16 and 8-bit versions are not vectorized because they need pack/unpack
+ patterns since __builtin_clz uses 32-bit parameter and return value. */
+/* { dg-final { scan-assembler-times {vclz\.i32 q[0-9]+, q[0-9]+} 2 } } */
/* { dg-final { scan-assembler-times {vclz\.i16 q[0-9]+, q[0-9]+} 2 { xfail *-*-* } } } */
/* { dg-final { scan-assembler-times {vclz\.i8 q[0-9]+, q[0-9]+} 2 { xfail *-*-* } } } */
diff --git a/gcc/testsuite/gcc.target/arm/simd/mve-vec-pack.c b/gcc/testsuite/gcc.target/arm/simd/mve-vec-pack.c
deleted file mode 100644
index 43642b2fec5..00000000000
--- a/gcc/testsuite/gcc.target/arm/simd/mve-vec-pack.c
+++ /dev/null
@@ -1,26 +0,0 @@
-/* { dg-do compile } */
-/* { dg-require-effective-target arm_v8_1m_mve_ok } */
-/* { dg-add-options arm_v8_1m_mve } */
-/* { dg-additional-options "-O3" } */
-
-#include <stdint.h>
-
-#define FUNC(SIGN, TYPE, DSTBITS, BITS, NAME) \
- void test_ ## NAME ##_ ## SIGN ## BITS (TYPE##DSTBITS##_t * __restrict__ dest, \
- TYPE##BITS##_t *a) { \
- int i; \
- for (i=0; i < (256 / BITS); i++) { \
- dest[i] = a[i]; \
- } \
- }
-
-FUNC(s, int, 16, 32, pack)
-FUNC(u, uint, 16, 32, pack)
-FUNC(s, int, 8, 16, pack)
-FUNC(u, uint, 8, 16, pack)
-
-/* { dg-final { scan-assembler-times {vmovnt\.i32\tq[0-9]+, q[0-9]+} 2 } } */
-/* { dg-final { scan-assembler-times {vmovnb\.i32\tq[0-9]+, q[0-9]+} 2 } } */
-/* { dg-final { scan-assembler-times {vmovnt\.i16\tq[0-9]+, q[0-9]+} 2 } } */
-/* { dg-final { scan-assembler-times {vmovnb\.i16\tq[0-9]+, q[0-9]+} 2 } } */
-/* { dg-final { scan-assembler-not {vldr\.64\td[0-9]+, \.L} } } */
diff --git a/gcc/testsuite/gcc.target/arm/simd/mve-vec-unpack.c b/gcc/testsuite/gcc.target/arm/simd/mve-vec-unpack.c
deleted file mode 100644
index cdc62f854ad..00000000000
--- a/gcc/testsuite/gcc.target/arm/simd/mve-vec-unpack.c
+++ /dev/null
@@ -1,29 +0,0 @@
-/* { dg-do compile } */
-/* { dg-require-effective-target arm_v8_1m_mve_ok } */
-/* { dg-add-options arm_v8_1m_mve } */
-/* { dg-additional-options "-O3" } */
-
-#include <stdint.h>
-
-#define FUNC(SIGN, TYPE, DSTBITS, BITS, NAME) \
- void test_ ## NAME ##_ ## SIGN ## BITS (TYPE##DSTBITS##_t * __restrict__ dest, \
- TYPE##BITS##_t *a) { \
- int i; \
- for (i=0; i < (128 / BITS); i++) { \
- dest[i] = a[i]; \
- } \
- }
-
-FUNC(s, int, 32, 16, unpack)
-FUNC(u, uint, 32, 16, unpack)
-FUNC(s, int, 16, 8, unpack)
-FUNC(u, uint, 16, 8, unpack)
-
-/* { dg-final { scan-assembler-times {vmovlt\.s16 q[0-9]+, q[0-9]+} 1 } } */
-/* { dg-final { scan-assembler-times {vmovlb\.s16 q[0-9]+, q[0-9]+} 1 } } */
-/* { dg-final { scan-assembler-times {vmovlt\.u16 q[0-9]+, q[0-9]+} 1 } } */
-/* { dg-final { scan-assembler-times {vmovlb\.u16 q[0-9]+, q[0-9]+} 1 } } */
-/* { dg-final { scan-assembler-times {vmovlt\.s8 q[0-9]+, q[0-9]+} 1 } } */
-/* { dg-final { scan-assembler-times {vmovlb\.s8 q[0-9]+, q[0-9]+} 1 } } */
-/* { dg-final { scan-assembler-times {vmovlt\.u8 q[0-9]+, q[0-9]+} 1 } } */
-/* { dg-final { scan-assembler-times {vmovlb\.u8 q[0-9]+, q[0-9]+} 1 } } */
diff --git a/gcc/testsuite/gcc.target/arm/simd/mve-vshl.c b/gcc/testsuite/gcc.target/arm/simd/mve-vshl.c
index 91dd942d818..7a0644997c8 100644
--- a/gcc/testsuite/gcc.target/arm/simd/mve-vshl.c
+++ b/gcc/testsuite/gcc.target/arm/simd/mve-vshl.c
@@ -56,10 +56,7 @@ FUNC_IMM(u, uint, 8, 16, <<, vshlimm)
/* MVE has only 128-bit vectors, so we can vectorize only half of the
functions above. */
/* We only emit vshl.u, which is equivalent to vshl.s anyway. */
-/* 16 and 8-bit versions still use 32-bit intermediate temporaries, so for
- instance instead of using vshl.u8, we need 4 vshl.i32, leading to a total of
- 14 vshl.i32 expected in this testcase. */
-/* { dg-final { scan-assembler-times {vshl.u[0-9]+\tq[0-9]+, q[0-9]+} 14 } } */
+/* { dg-final { scan-assembler-times {vshl.u[0-9]+\tq[0-9]+, q[0-9]+} 2 } } */
/* We emit vshl.i when the shift amount is an immediate. */
/* { dg-final { scan-assembler-times {vshl.i[0-9]+\tq[0-9]+, q[0-9]+} 6 } } */
diff --git a/gcc/testsuite/gcc.target/arm/simd/pr104882.c b/gcc/testsuite/gcc.target/arm/simd/pr104882.c
new file mode 100644
index 00000000000..ae9709af42f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/simd/pr104882.c
@@ -0,0 +1,16 @@
+/* { dg-do run } */
+/* { dg-require-effective-target arm_v8_1m_mve_ok } */
+/* { dg-add-options arm_v8_1m_mve } */
+/* { dg-additional-options "-O2" } */
+
+int i;
+char src[1072];
+char dst[72];
+int main() {
+ for (i = 0; i < 128; i++)
+ src[i] = i;
+ __builtin_memcpy(dst, src, 7);
+ for (i = 0; i < 7; i++)
+ if (dst[i] != i)
+ __builtin_abort();
+}
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