Hi, Robin.
+ machine_mode vmode;
+ switch (mode)
+ {
+ case QImode:
+ vmode = E_RVVM1QImode;
+ break;
+ case HImode:
+ vmode = E_RVVM1HImode;
+ break;
+ case SImode:
+ vmode = E_RVVM1SImode;
+ break;
+ case DImode:
+ vmode = E_RVVM1DImode;
+ break;
+ default:
+ gcc_unreachable ();
+ }
I suggest we adapt the MODE according to --param=riscv-autovec-lmul, so that we
could flexible using different LMUL according to
compile option.
Suggested adapt codes as follows:
unsigned int element_size = GET_MODE_SIZE (mode).to_constant ();
poly_int64 nunits = exact_div (BYTES_PER_RISCV_VECTOR * TARGET_MAX_LMUL,
element_size);
if (!get_vector_mode (mode, nunits).exists (&vmode))
gcc_unreachable ();
Also, this patch reminds me we are missing some more similiar builtin function
which can use RVV:
strlen, strcpy, strcmp...etc
They are implemented in rvv-next:
riscv-gcc/gcc/config/riscv/riscv-vector.cc at riscv-gcc-rvv-next ·
riscv-collab/riscv-gcc (github.com)
Is it reasonble we can add them back ?
[email protected]
From: Robin Dapp
Date: 2023-10-27 04:29
To: gcc-patches; palmer; Kito Cheng; jeffreyalaw; [email protected]
CC: rdapp.gcc
Subject: [PATCH] RISC-V: Add rawmemchr expander.
Hi,
this patch adds a vectorized rawmemchr expander.
It's basically strstr but for 8, 16 and 32-byte needles.
Apart from adjusting the common-code tests I re-used a
similar test that Stefan added to the s390 backend.
Regards
Robin
gcc/ChangeLog:
* config/riscv/autovec.md (rawmemchr<ANYI:mode>): New expander.
* config/riscv/riscv-protos.h (enum insn_type): Define.
(expand_rawmemchr): New function.
* config/riscv/riscv-v.cc (expand_rawmemchr): Add vectorized
rawmemchr.
* internal-fn.cc (expand_RAWMEMCHR): Fix typo.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/ldist-rawmemchr-1.c: Add riscv.
* gcc.dg/tree-ssa/ldist-rawmemchr-2.c: Ditto.
* gcc.target/riscv/rvv/autovec/rawmemchr-1.c: New test.
---
gcc/config/riscv/autovec.md | 13 +++
gcc/config/riscv/riscv-protos.h | 1 +
gcc/config/riscv/riscv-v.cc | 99 +++++++++++++++++++
gcc/internal-fn.cc | 2 +-
.../gcc.dg/tree-ssa/ldist-rawmemchr-1.c | 8 +-
.../gcc.dg/tree-ssa/ldist-rawmemchr-2.c | 8 +-
.../riscv/rvv/autovec/rawmemchr-1.c | 99 +++++++++++++++++++
7 files changed, 221 insertions(+), 9 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/rawmemchr-1.c
diff --git a/gcc/config/riscv/autovec.md b/gcc/config/riscv/autovec.md
index 80910ba3cc2..5f49d73be44 100644
--- a/gcc/config/riscv/autovec.md
+++ b/gcc/config/riscv/autovec.md
@@ -2367,3 +2367,16 @@ (define_expand "lfloor<mode><v_i_l_ll_convert>2"
DONE;
}
)
+
+;; Implement rawmemchr[qi|si|hi].
+(define_expand "rawmemchr<ANYI:mode>"
+ [(match_operand 0 "register_operand")
+ (match_operand 1 "memory_operand")
+ (match_operand:ANYI 2 "const_int_operand")]
+ "TARGET_VECTOR"
+ {
+ riscv_vector::expand_rawmemchr(<MODE>mode, operands[0], operands[1],
+ operands[2]);
+ DONE;
+ }
+)
diff --git a/gcc/config/riscv/riscv-protos.h b/gcc/config/riscv/riscv-protos.h
index 668d75043ca..3c092c82ab1 100644
--- a/gcc/config/riscv/riscv-protos.h
+++ b/gcc/config/riscv/riscv-protos.h
@@ -522,6 +522,7 @@ void expand_cond_unop (unsigned, rtx *);
void expand_cond_binop (unsigned, rtx *);
void expand_cond_ternop (unsigned, rtx *);
void expand_popcount (rtx *);
+void expand_rawmemchr (machine_mode, rtx, rtx, rtx);
/* Rounding mode bitfield for fixed point VXRM. */
enum fixed_point_rounding_mode
diff --git a/gcc/config/riscv/riscv-v.cc b/gcc/config/riscv/riscv-v.cc
index 3fe8125801b..653796a5ad2 100644
--- a/gcc/config/riscv/riscv-v.cc
+++ b/gcc/config/riscv/riscv-v.cc
@@ -2215,6 +2215,105 @@ expand_block_move (rtx dst_in, rtx src_in, rtx
length_in)
return true;
}
+/* Implement rawmemchr<mode> using vector instructions.
+ It can be assumed that the needle is in the haystack, otherwise the
+ behavior is undefined. */
+
+void
+expand_rawmemchr (machine_mode mode, rtx dst, rtx src, rtx pat)
+{
+ /*
+ rawmemchr:
+ loop:
+ vsetvli a1, zero, e[8,16,32,64], m1, ta, ma
+ vle[8,16,32,64]ff.v v8, (a0) # Load.
+ csrr a1, vl # Get number of bytes read.
+ vmseq.vx v0, v8, pat # v0 = (v8 == {pat, pat, ...})
+ vfirst.m a2, v0 # Find first hit.
+ add a0, a0, a1 # Bump pointer.
+ bltz a2, loop # Not found?
+
+ sub a0, a0, a1 # Go back by a1.
+ shll a2, a2, [0,1,2,3] # Shift to get byte offset.
+ add a0, a0, a2 # Add the offset.
+
+ ret
+ */
+ gcc_assert (TARGET_VECTOR);
+
+ machine_mode vmode;
+ switch (mode)
+ {
+ case QImode:
+ vmode = E_RVVM1QImode;
+ break;
+ case HImode:
+ vmode = E_RVVM1HImode;
+ break;
+ case SImode:
+ vmode = E_RVVM1SImode;
+ break;
+ case DImode:
+ vmode = E_RVVM1DImode;
+ break;
+ default:
+ gcc_unreachable ();
+ }
+ machine_mode mask_mode = get_mask_mode (vmode);
+
+ rtx cnt = gen_reg_rtx (Pmode);
+ rtx end = gen_reg_rtx (Pmode);
+ rtx vec = gen_reg_rtx (vmode);
+ rtx mask = gen_reg_rtx (mask_mode);
+
+ /* After finding the first vector element matching the needle, we
+ need to multiply by the vector element width (SEW) in order to
+ return a pointer to the matching byte. */
+ unsigned int shift = exact_log2 (GET_MODE_SIZE (mode).to_constant ());
+
+ rtx src_addr = copy_addr_to_reg (XEXP (src, 0));
+
+ rtx loop = gen_label_rtx ();
+ emit_label (loop);
+
+ rtx vsrc = change_address (src, vmode, src_addr);
+
+ /* Emit a first-fault load. */
+ rtx vlops[] = {vec, vsrc};
+ emit_vlmax_insn (code_for_pred_fault_load (vmode), UNARY_OP, vlops);
+
+ /* Read how far we read. */
+ if (Pmode == SImode)
+ emit_insn (gen_read_vlsi (cnt));
+ else
+ emit_insn (gen_read_vldi_zero_extend (cnt));
+
+ /* Compare needle with haystack and store in a mask. */
+ rtx eq = gen_rtx_EQ (mask_mode, gen_const_vec_duplicate (vmode, pat), vec);
+ rtx vmsops[] = {mask, eq, vec, pat};
+ emit_nonvlmax_insn (code_for_pred_eqne_scalar (vmode), COMPARE_OP, vmsops,
+ cnt);
+
+ /* Find the first bit in the mask. */
+ rtx vfops[] = {end, mask};
+ emit_nonvlmax_insn (code_for_pred_ffs (mask_mode, Pmode),
+ CPOP_OP, vfops, cnt);
+
+ /* Bump the pointer. */
+ emit_insn (gen_rtx_SET (src_addr, gen_rtx_PLUS (Pmode, src_addr, cnt)));
+
+ /* Emit the loop condition. */
+ rtx test = gen_rtx_LT (VOIDmode, end, const0_rtx);
+ emit_jump_insn (gen_cbranch4 (Pmode, test, end, const0_rtx, loop));
+
+ /* We overran by CNT, subtract it. */
+ emit_insn (gen_rtx_SET (src_addr, gen_rtx_MINUS (Pmode, src_addr, cnt)));
+
+ /* We found something at SRC + END * [1,2,4,8]. */
+ emit_insn (gen_rtx_SET (end, gen_rtx_ASHIFT (Pmode, end, GEN_INT (shift))));
+ emit_insn (gen_rtx_SET (dst, gen_rtx_PLUS (Pmode, src_addr, end)));
+}
+
/* Return the vectorization machine mode for RVV according to LMUL. */
machine_mode
preferred_simd_mode (scalar_mode mode)
diff --git a/gcc/internal-fn.cc b/gcc/internal-fn.cc
index 61d5a9e4772..e7451b96353 100644
--- a/gcc/internal-fn.cc
+++ b/gcc/internal-fn.cc
@@ -3208,7 +3208,7 @@ expand_VEC_CONVERT (internal_fn, gcall *)
gcc_unreachable ();
}
-/* Expand IFN_RAWMEMCHAR internal function. */
+/* Expand IFN_RAWMEMCHR internal function. */
void
expand_RAWMEMCHR (internal_fn, gcall *stmt)
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ldist-rawmemchr-1.c
b/gcc/testsuite/gcc.dg/tree-ssa/ldist-rawmemchr-1.c
index bf6335f6360..adf53b10def 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/ldist-rawmemchr-1.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/ldist-rawmemchr-1.c
@@ -1,9 +1,9 @@
-/* { dg-do run { target s390x-*-* } } */
+/* { dg-do run { target { { s390x-*-* } || { riscv_v } } } } */
/* { dg-options "-O2 -ftree-loop-distribution -fdump-tree-ldist-details" } */
/* { dg-additional-options "-march=z13 -mzarch" { target s390x-*-* } } */
-/* { dg-final { scan-tree-dump-times "generated rawmemchrQI" 2 "ldist" {
target s390x-*-* } } } */
-/* { dg-final { scan-tree-dump-times "generated rawmemchrHI" 2 "ldist" {
target s390x-*-* } } } */
-/* { dg-final { scan-tree-dump-times "generated rawmemchrSI" 2 "ldist" {
target s390x-*-* } } } */
+/* { dg-final { scan-tree-dump-times "generated rawmemchrQI" 2 "ldist" {
target { { s390x-*-* } || { riscv_v } } } } } */
+/* { dg-final { scan-tree-dump-times "generated rawmemchrHI" 2 "ldist" {
target { { s390x-*-* } || { riscv_v } } } } } */
+/* { dg-final { scan-tree-dump-times "generated rawmemchrSI" 2 "ldist" {
target { { s390x-*-* } || { riscv_v } } } } } */
/* Rawmemchr pattern: reduction stmt and no store */
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ldist-rawmemchr-2.c
b/gcc/testsuite/gcc.dg/tree-ssa/ldist-rawmemchr-2.c
index 83f5a35a322..6c8a485a3aa 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/ldist-rawmemchr-2.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/ldist-rawmemchr-2.c
@@ -1,9 +1,9 @@
-/* { dg-do run { target s390x-*-* } } */
+/* { dg-do run { target { { s390x-*-* } || { riscv_v } } } } */
/* { dg-options "-O2 -ftree-loop-distribution -fdump-tree-ldist-details" } */
/* { dg-additional-options "-march=z13 -mzarch" { target s390x-*-* } } */
-/* { dg-final { scan-tree-dump-times "generated rawmemchrQI" 2 "ldist" {
target s390x-*-* } } } */
-/* { dg-final { scan-tree-dump-times "generated rawmemchrHI" 2 "ldist" {
target s390x-*-* } } } */
-/* { dg-final { scan-tree-dump-times "generated rawmemchrSI" 2 "ldist" {
target s390x-*-* } } } */
+/* { dg-final { scan-tree-dump-times "generated rawmemchrQI" 2 "ldist" {
target { { s390x-*-* } || { riscv_v } } } } } */
+/* { dg-final { scan-tree-dump-times "generated rawmemchrHI" 2 "ldist" {
target { { s390x-*-* } || { riscv_v } } } } } */
+/* { dg-final { scan-tree-dump-times "generated rawmemchrSI" 2 "ldist" {
target { { s390x-*-* } || { riscv_v } } } } } */
/* Rawmemchr pattern: reduction stmt and store */
diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/rawmemchr-1.c
b/gcc/testsuite/gcc.target/riscv/rvv/autovec/rawmemchr-1.c
new file mode 100644
index 00000000000..ba83cb3836f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/rawmemchr-1.c
@@ -0,0 +1,99 @@
+/* { dg-do run { target { riscv_v } } } */
+/* { dg-additional-options "-std=gnu99 -O2 -ftree-loop-distribution
-fdump-tree-ldist-details" } */
+/* { dg-final { scan-tree-dump-times "generated rawmemchrQI" 2 "ldist" } } */
+/* { dg-final { scan-tree-dump-times "generated rawmemchrHI" 2 "ldist" } } */
+/* { dg-final { scan-tree-dump-times "generated rawmemchrSI" 2 "ldist" } } */
+
+#include <string.h>
+#include <assert.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#define rawmemchrT(T, pattern) \
+__attribute__((noinline,noclone)) \
+T* rawmemchr_##T (T *s) \
+{ \
+ while (*s != pattern) \
+ ++s; \
+ return s; \
+}
+
+rawmemchrT(int8_t, (int8_t)0xde)
+rawmemchrT(uint8_t, 0xde)
+rawmemchrT(int16_t, (int16_t)0xdead)
+rawmemchrT(uint16_t, 0xdead)
+rawmemchrT(int32_t, (int32_t)0xdeadbeef)
+rawmemchrT(uint32_t, 0xdeadbeef)
+
+#define runT(T, pattern) \
+void run_##T () \
+{ \
+ T *buf = malloc (4096 * 2 * sizeof(T)); \
+ assert (buf != NULL); \
+ memset (buf, 0xa, 4096 * 2 * sizeof(T)); \
+ /* ensure q is 4096-byte aligned */ \
+ T *q = (T*)((unsigned char *)buf \
+ + (4096 - ((uintptr_t)buf & 4095))); \
+ T *p; \
+ /* unaligned + block boundary + 1st load */ \
+ p = (T *) ((uintptr_t)q - 8); \
+ p[2] = pattern; \
+ assert ((rawmemchr_##T (&p[0]) == &p[2])); \
+ p[2] = (T) 0xaaaaaaaa; \
+ /* unaligned + block boundary + 2nd load */ \
+ p = (T *) ((uintptr_t)q - 8); \
+ p[6] = pattern; \
+ assert ((rawmemchr_##T (&p[0]) == &p[6])); \
+ p[6] = (T) 0xaaaaaaaa; \
+ /* unaligned + 1st load */ \
+ q[5] = pattern; \
+ assert ((rawmemchr_##T (&q[2]) == &q[5])); \
+ q[5] = (T) 0xaaaaaaaa; \
+ /* unaligned + 2nd load */ \
+ q[14] = pattern; \
+ assert ((rawmemchr_##T (&q[2]) == &q[14])); \
+ q[14] = (T) 0xaaaaaaaa; \
+ /* unaligned + 3rd load */ \
+ q[19] = pattern; \
+ assert ((rawmemchr_##T (&q[2]) == &q[19])); \
+ q[19] = (T) 0xaaaaaaaa; \
+ /* unaligned + 4th load */ \
+ q[25] = pattern; \
+ assert ((rawmemchr_##T (&q[2]) == &q[25])); \
+ q[25] = (T) 0xaaaaaaaa; \
+ /* aligned + 1st load */ \
+ q[5] = pattern; \
+ assert ((rawmemchr_##T (&q[0]) == &q[5])); \
+ q[5] = (T) 0xaaaaaaaa; \
+ /* aligned + 2nd load */ \
+ q[14] = pattern; \
+ assert ((rawmemchr_##T (&q[0]) == &q[14])); \
+ q[14] = (T) 0xaaaaaaaa; \
+ /* aligned + 3rd load */ \
+ q[19] = pattern; \
+ assert ((rawmemchr_##T (&q[0]) == &q[19])); \
+ q[19] = (T) 0xaaaaaaaa; \
+ /* aligned + 4th load */ \
+ q[25] = pattern; \
+ assert ((rawmemchr_##T (&q[0]) == &q[25])); \
+ q[25] = (T) 0xaaaaaaaa; \
+ free (buf); \
+}
+
+runT(int8_t, (int8_t)0xde)
+runT(uint8_t, 0xde)
+runT(int16_t, (int16_t)0xdead)
+runT(uint16_t, 0xdead)
+runT(int32_t, (int32_t)0xdeadbeef)
+runT(uint32_t, 0xdeadbeef)
+
+int main (void)
+{
+ run_uint8_t ();
+ run_int8_t ();
+ run_uint16_t ();
+ run_int16_t ();
+ run_uint32_t ();
+ run_int32_t ();
+ return 0;
+}
--
2.41.0
