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[PATCH][AArch64] Fix PR/65770 vstN_lane on bigendian
- From: Alan Lawrence <alan dot lawrence at arm dot com>
- To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Cc: Marcus Shawcroft <Marcus dot Shawcroft at arm dot com>, Charles Baylis <charles dot baylis at linaro dot org>
- Date: Thu, 16 Apr 2015 18:27:31 +0100
- Subject: [PATCH][AArch64] Fix PR/65770 vstN_lane on bigendian
- Authentication-results: sourceware.org; auth=none
As per bugzilla entry, indices in the generated assembly for bigendian are
flipped when they should not be (and, flipped always relative to a Q-register!).
This flips the lane indices back again at assembly time, fixing PR. The
"indices" contained in the RTL are still wrong for D registers, but these are
only parameters to an UNSPEC and so never acted upon. (Nonetheless I intend to
fix this anomaly in later patches).
Tested check-gcc on aarch64-none-elf and aarch64_be-none-elf.
New test (initially failing on bigendian) now passing on both.
gcc/ChangeLog:
PR target/65770
config/aarch64/aarch64-simd.md (vec_store_lanesoi_lane<mode>,
vec_store_lanesci_lane<mode>, vec_store_lanesxi_lane<mode>):
Flip lane index back at assembly time for bigendian.
gcc/testsuite/ChangeLog:
PR target/65770
gcc.target/aarch64/vstN_lane_1.c: New file.
diff --git a/gcc/config/aarch64/aarch64-simd.md b/gcc/config/aarch64/aarch64-simd.md
index 055757036d54d0d5cf5df4bd05419e39ea119f46..b84374443a08a89a7b7c372b1585e128ac8b7fdd 100644
--- a/gcc/config/aarch64/aarch64-simd.md
+++ b/gcc/config/aarch64/aarch64-simd.md
@@ -3954,6 +3954,7 @@
[(set_attr "type" "neon_store2_2reg<q>")]
)
+;; RTL uses GCC vector extension indices, so flip only for assembly.
(define_insn "vec_store_lanesoi_lane<mode>"
[(set (match_operand:<V_TWO_ELEM> 0 "aarch64_simd_struct_operand" "=Utv")
(unspec:<V_TWO_ELEM> [(match_operand:OI 1 "register_operand" "w")
@@ -3961,7 +3962,10 @@
(match_operand:SI 2 "immediate_operand" "i")]
UNSPEC_ST2_LANE))]
"TARGET_SIMD"
- "st2\\t{%S1.<Vetype> - %T1.<Vetype>}[%2], %0"
+ {
+ operands[2] = GEN_INT (ENDIAN_LANE_N (<MODE>mode, INTVAL (operands[2])));
+ return "st2\\t{%S1.<Vetype> - %T1.<Vetype>}[%2], %0";
+ }
[(set_attr "type" "neon_store3_one_lane<q>")]
)
@@ -4045,6 +4049,7 @@
[(set_attr "type" "neon_store3_3reg<q>")]
)
+;; RTL uses GCC vector extension indices, so flip only for assembly.
(define_insn "vec_store_lanesci_lane<mode>"
[(set (match_operand:<V_THREE_ELEM> 0 "aarch64_simd_struct_operand" "=Utv")
(unspec:<V_THREE_ELEM> [(match_operand:CI 1 "register_operand" "w")
@@ -4052,7 +4057,10 @@
(match_operand:SI 2 "immediate_operand" "i")]
UNSPEC_ST3_LANE))]
"TARGET_SIMD"
- "st3\\t{%S1.<Vetype> - %U1.<Vetype>}[%2], %0"
+ {
+ operands[2] = GEN_INT (ENDIAN_LANE_N (<MODE>mode, INTVAL (operands[2])));
+ return "st3\\t{%S1.<Vetype> - %U1.<Vetype>}[%2], %0";
+ }
[(set_attr "type" "neon_store3_one_lane<q>")]
)
@@ -4136,6 +4144,7 @@
[(set_attr "type" "neon_store4_4reg<q>")]
)
+;; RTL uses GCC vector extension indices, so flip only for assembly.
(define_insn "vec_store_lanesxi_lane<mode>"
[(set (match_operand:<V_FOUR_ELEM> 0 "aarch64_simd_struct_operand" "=Utv")
(unspec:<V_FOUR_ELEM> [(match_operand:XI 1 "register_operand" "w")
@@ -4143,7 +4152,10 @@
(match_operand:SI 2 "immediate_operand" "i")]
UNSPEC_ST4_LANE))]
"TARGET_SIMD"
- "st4\\t{%S1.<Vetype> - %V1.<Vetype>}[%2], %0"
+ {
+ operands[2] = GEN_INT (ENDIAN_LANE_N (<MODE>mode, INTVAL (operands[2])));
+ return "st4\\t{%S1.<Vetype> - %V1.<Vetype>}[%2], %0";
+ }
[(set_attr "type" "neon_store4_one_lane<q>")]
)
diff --git a/gcc/testsuite/gcc.target/aarch64/vstN_lane_1.c b/gcc/testsuite/gcc.target/aarch64/vstN_lane_1.c
new file mode 100644
index 0000000000000000000000000000000000000000..a695aa1954036ef1c1782b14ddb3c46ec78b5f0b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/vstN_lane_1.c
@@ -0,0 +1,75 @@
+/* { dg-do run } */
+/* { dg-options "-O3 -fno-inline" } */
+
+#include <arm_neon.h>
+
+extern void abort (void);
+
+#define VARIANTS(VARIANT, STRUCT) \
+VARIANT (uint8, , 8, _u8, 6, STRUCT) \
+VARIANT (uint16, , 4, _u16, 3, STRUCT) \
+VARIANT (uint32, , 2, _u32, 1, STRUCT) \
+VARIANT (uint64, , 1, _u64, 0, STRUCT) \
+VARIANT (int8, , 8, _s8, 5, STRUCT) \
+VARIANT (int16, , 4, _s16, 2, STRUCT) \
+VARIANT (int32, , 2, _s32, 0, STRUCT) \
+VARIANT (int64, , 1, _s64, 0, STRUCT) \
+VARIANT (poly8, , 8, _p8, 7, STRUCT) \
+VARIANT (poly16, , 4, _p16, 1, STRUCT) \
+VARIANT (float32, , 2, _f32, 1, STRUCT) \
+VARIANT (float64, , 1, _f64, 0, STRUCT) \
+VARIANT (uint8, q, 16, _u8, 14, STRUCT) \
+VARIANT (uint16, q, 8, _u16, 4, STRUCT) \
+VARIANT (uint32, q, 4, _u32, 3, STRUCT) \
+VARIANT (uint64, q, 2, _u64, 0, STRUCT) \
+VARIANT (int8, q, 16, _s8, 13, STRUCT) \
+VARIANT (int16, q, 8, _s16, 6, STRUCT) \
+VARIANT (int32, q, 4, _s32, 2, STRUCT) \
+VARIANT (int64, q, 2, _s64, 1, STRUCT) \
+VARIANT (poly8, q, 16, _p8, 12, STRUCT) \
+VARIANT (poly16, q, 8, _p16, 5, STRUCT) \
+VARIANT (float32, q, 4, _f32, 1, STRUCT)\
+VARIANT (float64, q, 2, _f64, 0, STRUCT)
+
+#define TESTMETH(BASE, Q, ELTS, SUFFIX, LANE, STRUCT) \
+int \
+test_vst##STRUCT##Q##_lane##SUFFIX (const BASE##_t *data) \
+{ \
+ BASE##x##ELTS##x##STRUCT##_t vectors; \
+ for (int i = 0; i < STRUCT; i++, data += ELTS) \
+ vectors.val[i] = vld1##Q##SUFFIX (data); \
+ BASE##_t temp[STRUCT]; \
+ vst##STRUCT##Q##_lane##SUFFIX (temp, vectors, LANE); \
+ for (int i = 0; i < STRUCT; i++) \
+ { \
+ if (temp[i] != vget##Q##_lane##SUFFIX (vectors.val[i], LANE)) \
+ return 1; \
+ } \
+ return 0; \
+}
+
+/* Tests of vst2_lane and vst2q_lane. */
+VARIANTS (TESTMETH, 2)
+/* Tests of vst3_lane and vst3q_lane. */
+VARIANTS (TESTMETH, 3)
+/* Tests of vst4_lane and vst4q_lane. */
+VARIANTS (TESTMETH, 4)
+
+#define CHECK(BASE, Q, ELTS, SUFFIX, LANE, STRUCT) \
+ if (test_vst##STRUCT##Q##_lane##SUFFIX ((const BASE##_t *)orig_data)) \
+ abort ();
+
+int
+main (int argc, char **argv)
+{
+ /* Original data for all vector formats. */
+ uint64_t orig_data[8] = {0x1234567890abcdefULL, 0x13579bdf02468aceULL,
+ 0x012389ab4567cdefULL, 0xfeeddadacafe0431ULL,
+ 0x1032547698badcfeULL, 0xbadbadbadbad0badULL,
+ 0x0102030405060708ULL, 0x0f0e0d0c0b0a0908ULL};
+
+ VARIANTS (CHECK, 2);
+ VARIANTS (CHECK, 3);
+ VARIANTS (CHECK, 4);
+ return 0;
+}