On 8 October 2015 at 11:12, James Greenhalgh <[email protected]> wrote:
> On Wed, Oct 07, 2015 at 09:07:30PM +0100, Christophe Lyon wrote:
>> On 7 October 2015 at 17:09, James Greenhalgh <[email protected]>
>> wrote:
>> > On Tue, Sep 15, 2015 at 05:25:25PM +0100, Christophe Lyon wrote:
>> >
>> > Why do we want this for vtbx4 rather than putting out a VTBX instruction
>> > directly (as in the inline asm versions you replace)?
>> >
>> I just followed the pattern used for vtbx3.
>>
>> > This sequence does make sense for vtbx3.
>> In fact, I don't see why vtbx3 and vtbx4 should be different?
>
> The difference between TBL and TBX is in their handling of a request to
> select an out-of-range value. For TBL this returns zero, for TBX this
> returns the value which was already in the destination register.
>
> Because the byte-vectors used by the TBX instruction in aarch64 are 128-bit
> (so two of them togather allow selecting elements in the range 0-31), and
> vtbx3 needs to emulate the AArch32 behaviour of picking elements from 3x64-bit
> vectors (allowing elements in the range 0-23), we need to manually check for
> values which would have been out-of-range on AArch32, but are not out
> of range for AArch64 and handle them appropriately. For vtbx4 on the other
> hand, 2x128-bit registers give the range 0..31 and 4x64-bit registers give
> the range 0..31, so we don't need the special masked handling.
>
> You can find the suggested instruction sequences for the Neon intrinsics
> in this document:
>
>
> http://infocenter.arm.com/help/topic/com.arm.doc.ihi0073a/IHI0073A_arm_neon_intrinsics_ref.pdf
>
Hi James,
Please find attached an updated version which hopefully addresses your comments.
Tested on aarch64-none-elf and aarch64_be-none-elf using the Foundation Model.
OK?
Christophe.
>> >> /* vtrn */
>> >>
>> >> __extension__ static __inline float32x2_t __attribute__
>> >> ((__always_inline__))
>> >> diff --git a/gcc/config/aarch64/iterators.md
>> >> b/gcc/config/aarch64/iterators.md
>> >> index b8a45d1..dfbd9cd 100644
>> >> --- a/gcc/config/aarch64/iterators.md
>> >> +++ b/gcc/config/aarch64/iterators.md
>> >> @@ -100,6 +100,8 @@
>> >> ;; All modes.
>> >> (define_mode_iterator VALL [V8QI V16QI V4HI V8HI V2SI V4SI V2DI V2SF
>> >> V4SF V2DF])
>> >>
>> >> +(define_mode_iterator V8Q [V8QI])
>> >> +
>> >
>> > This can be dropped if you use VAR1 in aarch64-builtins.c.
>> >
>> > Thanks for working on this, with your patch applied, the only
>> > remaining intrinsics I see failing for aarch64_be are:
>> >
>> > vqtbl2_*8
>> > vqtbl2q_*8
>> > vqtbl3_*8
>> > vqtbl3q_*8
>> > vqtbl4_*8
>> > vqtbl4q_*8
>> >
>> > vqtbx2_*8
>> > vqtbx2q_*8
>> > vqtbx3_*8
>> > vqtbx3q_*8
>> > vqtbx4_*8
>> > vqtbx4q_*8
>> >
>> Quite possibly. Which tests are you looking at? Since these are
>> aarch64-specific, they are not part of the
>> tests I added (advsimd-intrinsics). Do you mean
>> gcc.target/aarch64/table-intrinsics.c?
>
> Sorry, yes I should have given a reference. I'm running with a variant of
> a testcase from the LLVM test-suite repository:
>
> SingleSource/UnitTests/Vector/AArch64/aarch64_neon_intrinsics.c
>
> This has an execute test for most of the intrinsics specified for AArch64.
> It needs some modification to cover the intrinsics we don't implement yet.
>
> Thanks,
> James
>
2015-10-09 Christophe Lyon <[email protected]>
* config/aarch64/aarch64-simd-builtins.def: Update builtins
tables: add tbl3 and tbx4.
* config/aarch64/aarch64-simd.md (aarch64_tbl3v8qi): New.
(aarch64_tbx4v8qi): New.
* config/aarch64/arm_neon.h (vtbl3_s8, vtbl3_u8, vtbl3_p8)
(vtbl4_s8, vtbl4_u8, vtbl4_p8, vtbx4_s8, vtbx4_u8, vtbx4_p8):
Rewrite using builtin functions.
* config/aarch64/iterators.md (UNSPEC_TBX): New.
diff --git a/gcc/config/aarch64/aarch64-simd-builtins.def b/gcc/config/aarch64/aarch64-simd-builtins.def
index d0f298a..c16e82c9 100644
--- a/gcc/config/aarch64/aarch64-simd-builtins.def
+++ b/gcc/config/aarch64/aarch64-simd-builtins.def
@@ -405,3 +405,8 @@
VAR1 (BINOPP, crypto_pmull, 0, di)
VAR1 (BINOPP, crypto_pmull, 0, v2di)
+ /* Implemented by aarch64_tbl3v8qi. */
+ VAR1 (BINOP, tbl3, 0, v8qi)
+
+ /* Implemented by aarch64_tbx4v8qi. */
+ VAR1 (TERNOP, tbx4, 0, v8qi)
diff --git a/gcc/config/aarch64/aarch64-simd.md b/gcc/config/aarch64/aarch64-simd.md
index 9777418..6027582 100644
--- a/gcc/config/aarch64/aarch64-simd.md
+++ b/gcc/config/aarch64/aarch64-simd.md
@@ -4716,6 +4714,27 @@
[(set_attr "type" "neon_tbl2_q")]
)
+(define_insn "aarch64_tbl3v8qi"
+ [(set (match_operand:V8QI 0 "register_operand" "=w")
+ (unspec:V8QI [(match_operand:OI 1 "register_operand" "w")
+ (match_operand:V8QI 2 "register_operand" "w")]
+ UNSPEC_TBL))]
+ "TARGET_SIMD"
+ "tbl\\t%S0.8b, {%S1.16b - %T1.16b}, %S2.8b"
+ [(set_attr "type" "neon_tbl3")]
+)
+
+(define_insn "aarch64_tbx4v8qi"
+ [(set (match_operand:V8QI 0 "register_operand" "=w")
+ (unspec:V8QI [(match_operand:V8QI 1 "register_operand" "0")
+ (match_operand:OI 2 "register_operand" "w")
+ (match_operand:V8QI 3 "register_operand" "w")]
+ UNSPEC_TBX))]
+ "TARGET_SIMD"
+ "tbx\\t%S0.8b, {%S2.16b - %T2.16b}, %S3.8b"
+ [(set_attr "type" "neon_tbl4")]
+)
+
(define_insn_and_split "aarch64_combinev16qi"
[(set (match_operand:OI 0 "register_operand" "=w")
(unspec:OI [(match_operand:V16QI 1 "register_operand" "w")
diff --git a/gcc/config/aarch64/arm_neon.h b/gcc/config/aarch64/arm_neon.h
index 6dfebe7..e99819e 100644
--- a/gcc/config/aarch64/arm_neon.h
+++ b/gcc/config/aarch64/arm_neon.h
@@ -10902,13 +10902,14 @@ vtbl3_s8 (int8x8x3_t tab, int8x8_t idx)
{
int8x8_t result;
int8x16x2_t temp;
+ __builtin_aarch64_simd_oi __o;
temp.val[0] = vcombine_s8 (tab.val[0], tab.val[1]);
temp.val[1] = vcombine_s8 (tab.val[2], vcreate_s8 (__AARCH64_UINT64_C (0x0)));
- __asm__ ("ld1 {v16.16b - v17.16b }, %1\n\t"
- "tbl %0.8b, {v16.16b - v17.16b}, %2.8b\n\t"
- : "=w"(result)
- : "Q"(temp), "w"(idx)
- : "v16", "v17", "memory");
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[0], 0);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[1], 1);
+ result = __builtin_aarch64_tbl3v8qi (__o, idx);
return result;
}
@@ -10917,13 +10918,14 @@ vtbl3_u8 (uint8x8x3_t tab, uint8x8_t idx)
{
uint8x8_t result;
uint8x16x2_t temp;
+ __builtin_aarch64_simd_oi __o;
temp.val[0] = vcombine_u8 (tab.val[0], tab.val[1]);
temp.val[1] = vcombine_u8 (tab.val[2], vcreate_u8 (__AARCH64_UINT64_C (0x0)));
- __asm__ ("ld1 {v16.16b - v17.16b }, %1\n\t"
- "tbl %0.8b, {v16.16b - v17.16b}, %2.8b\n\t"
- : "=w"(result)
- : "Q"(temp), "w"(idx)
- : "v16", "v17", "memory");
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[0], 0);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[1], 1);
+ result = (uint8x8_t)__builtin_aarch64_tbl3v8qi (__o, (int8x8_t)idx);
return result;
}
@@ -10932,13 +10934,14 @@ vtbl3_p8 (poly8x8x3_t tab, uint8x8_t idx)
{
poly8x8_t result;
poly8x16x2_t temp;
+ __builtin_aarch64_simd_oi __o;
temp.val[0] = vcombine_p8 (tab.val[0], tab.val[1]);
temp.val[1] = vcombine_p8 (tab.val[2], vcreate_p8 (__AARCH64_UINT64_C (0x0)));
- __asm__ ("ld1 {v16.16b - v17.16b }, %1\n\t"
- "tbl %0.8b, {v16.16b - v17.16b}, %2.8b\n\t"
- : "=w"(result)
- : "Q"(temp), "w"(idx)
- : "v16", "v17", "memory");
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[0], 0);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[1], 1);
+ result = (poly8x8_t)__builtin_aarch64_tbl3v8qi (__o, (int8x8_t)idx);
return result;
}
@@ -10947,13 +10950,14 @@ vtbl4_s8 (int8x8x4_t tab, int8x8_t idx)
{
int8x8_t result;
int8x16x2_t temp;
+ __builtin_aarch64_simd_oi __o;
temp.val[0] = vcombine_s8 (tab.val[0], tab.val[1]);
temp.val[1] = vcombine_s8 (tab.val[2], tab.val[3]);
- __asm__ ("ld1 {v16.16b - v17.16b }, %1\n\t"
- "tbl %0.8b, {v16.16b - v17.16b}, %2.8b\n\t"
- : "=w"(result)
- : "Q"(temp), "w"(idx)
- : "v16", "v17", "memory");
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[0], 0);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[1], 1);
+ result = __builtin_aarch64_tbl3v8qi (__o, idx);
return result;
}
@@ -10962,13 +10966,14 @@ vtbl4_u8 (uint8x8x4_t tab, uint8x8_t idx)
{
uint8x8_t result;
uint8x16x2_t temp;
+ __builtin_aarch64_simd_oi __o;
temp.val[0] = vcombine_u8 (tab.val[0], tab.val[1]);
temp.val[1] = vcombine_u8 (tab.val[2], tab.val[3]);
- __asm__ ("ld1 {v16.16b - v17.16b }, %1\n\t"
- "tbl %0.8b, {v16.16b - v17.16b}, %2.8b\n\t"
- : "=w"(result)
- : "Q"(temp), "w"(idx)
- : "v16", "v17", "memory");
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[0], 0);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[1], 1);
+ result = (uint8x8_t)__builtin_aarch64_tbl3v8qi (__o, (int8x8_t)idx);
return result;
}
@@ -10977,13 +10982,14 @@ vtbl4_p8 (poly8x8x4_t tab, uint8x8_t idx)
{
poly8x8_t result;
poly8x16x2_t temp;
+ __builtin_aarch64_simd_oi __o;
temp.val[0] = vcombine_p8 (tab.val[0], tab.val[1]);
temp.val[1] = vcombine_p8 (tab.val[2], tab.val[3]);
- __asm__ ("ld1 {v16.16b - v17.16b }, %1\n\t"
- "tbl %0.8b, {v16.16b - v17.16b}, %2.8b\n\t"
- : "=w"(result)
- : "Q"(temp), "w"(idx)
- : "v16", "v17", "memory");
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[0], 0);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[1], 1);
+ result = (poly8x8_t)__builtin_aarch64_tbl3v8qi (__o, (int8x8_t)idx);
return result;
}
@@ -11023,51 +11029,6 @@ vtbx2_p8 (poly8x8_t r, poly8x8x2_t tab, uint8x8_t idx)
return result;
}
-__extension__ static __inline int8x8_t __attribute__ ((__always_inline__))
-vtbx4_s8 (int8x8_t r, int8x8x4_t tab, int8x8_t idx)
-{
- int8x8_t result = r;
- int8x16x2_t temp;
- temp.val[0] = vcombine_s8 (tab.val[0], tab.val[1]);
- temp.val[1] = vcombine_s8 (tab.val[2], tab.val[3]);
- __asm__ ("ld1 {v16.16b - v17.16b }, %1\n\t"
- "tbx %0.8b, {v16.16b - v17.16b}, %2.8b\n\t"
- : "+w"(result)
- : "Q"(temp), "w"(idx)
- : "v16", "v17", "memory");
- return result;
-}
-
-__extension__ static __inline uint8x8_t __attribute__ ((__always_inline__))
-vtbx4_u8 (uint8x8_t r, uint8x8x4_t tab, uint8x8_t idx)
-{
- uint8x8_t result = r;
- uint8x16x2_t temp;
- temp.val[0] = vcombine_u8 (tab.val[0], tab.val[1]);
- temp.val[1] = vcombine_u8 (tab.val[2], tab.val[3]);
- __asm__ ("ld1 {v16.16b - v17.16b }, %1\n\t"
- "tbx %0.8b, {v16.16b - v17.16b}, %2.8b\n\t"
- : "+w"(result)
- : "Q"(temp), "w"(idx)
- : "v16", "v17", "memory");
- return result;
-}
-
-__extension__ static __inline poly8x8_t __attribute__ ((__always_inline__))
-vtbx4_p8 (poly8x8_t r, poly8x8x4_t tab, uint8x8_t idx)
-{
- poly8x8_t result = r;
- poly8x16x2_t temp;
- temp.val[0] = vcombine_p8 (tab.val[0], tab.val[1]);
- temp.val[1] = vcombine_p8 (tab.val[2], tab.val[3]);
- __asm__ ("ld1 {v16.16b - v17.16b }, %1\n\t"
- "tbx %0.8b, {v16.16b - v17.16b}, %2.8b\n\t"
- : "+w"(result)
- : "Q"(temp), "w"(idx)
- : "v16", "v17", "memory");
- return result;
-}
-
/* End of temporary inline asm. */
/* Start of optimal implementations in approved order. */
@@ -23221,6 +23182,58 @@ vtbx3_p8 (poly8x8_t __r, poly8x8x3_t __tab, uint8x8_t __idx)
return vbsl_p8 (__mask, __tbl, __r);
}
+/* vtbx4 */
+
+__extension__ static __inline int8x8_t __attribute__ ((__always_inline__))
+vtbx4_s8 (int8x8_t __r, int8x8x4_t __tab, int8x8_t __idx)
+{
+ int8x8_t result;
+ int8x16x2_t temp;
+ __builtin_aarch64_simd_oi __o;
+ temp.val[0] = vcombine_s8 (__tab.val[0], __tab.val[1]);
+ temp.val[1] = vcombine_s8 (__tab.val[2], __tab.val[3]);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[0], 0);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[1], 1);
+ result = __builtin_aarch64_tbx4v8qi (__r, __o, __idx);
+ return result;
+}
+
+__extension__ static __inline uint8x8_t __attribute__ ((__always_inline__))
+vtbx4_u8 (uint8x8_t __r, uint8x8x4_t __tab, uint8x8_t __idx)
+{
+ uint8x8_t result;
+ uint8x16x2_t temp;
+ __builtin_aarch64_simd_oi __o;
+ temp.val[0] = vcombine_u8 (__tab.val[0], __tab.val[1]);
+ temp.val[1] = vcombine_u8 (__tab.val[2], __tab.val[3]);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[0], 0);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[1], 1);
+ result = (uint8x8_t)__builtin_aarch64_tbx4v8qi ((int8x8_t)__r, __o,
+ (int8x8_t)__idx);
+ return result;
+}
+
+__extension__ static __inline poly8x8_t __attribute__ ((__always_inline__))
+vtbx4_p8 (poly8x8_t __r, poly8x8x4_t __tab, uint8x8_t __idx)
+{
+ poly8x8_t result;
+ poly8x16x2_t temp;
+ __builtin_aarch64_simd_oi __o;
+ temp.val[0] = vcombine_p8 (__tab.val[0], __tab.val[1]);
+ temp.val[1] = vcombine_p8 (__tab.val[2], __tab.val[3]);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[0], 0);
+ __o = __builtin_aarch64_set_qregoiv16qi (__o,
+ (int8x16_t) temp.val[1], 1);
+ result = (poly8x8_t)__builtin_aarch64_tbx4v8qi ((int8x8_t)__r, __o,
+ (int8x8_t)__idx);
+ return result;
+}
+
/* vtrn */
__extension__ static __inline float32x2_t __attribute__ ((__always_inline__))
diff --git a/gcc/config/aarch64/iterators.md b/gcc/config/aarch64/iterators.md
index b8a45d1..d856117 100644
--- a/gcc/config/aarch64/iterators.md
+++ b/gcc/config/aarch64/iterators.md
@@ -253,6 +253,7 @@
UNSPEC_USHLL ; Used in aarch64-simd.md.
UNSPEC_ADDP ; Used in aarch64-simd.md.
UNSPEC_TBL ; Used in vector permute patterns.
+ UNSPEC_TBX ; Used in vector permute patterns.
UNSPEC_CONCAT ; Used in vector permute patterns.
UNSPEC_ZIP1 ; Used in vector permute patterns.
UNSPEC_ZIP2 ; Used in vector permute patterns.
