[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v2] target/arm: Vectorize USHL and SSHL
|
From: |
Richard Henderson |
|
Subject: |
[Qemu-devel] [PATCH v2] target/arm: Vectorize USHL and SSHL |
|
Date: |
Mon, 3 Jun 2019 18:22:09 -0500 |
These instructions shift left or right depending on the sign
of the input, and 7 bits are significant to the shift. This
requires several masks and selects in addition to the actual
shifts to form the complete answer.
That said, the operation is still a small improvement even for
two 64-bit elements -- 13 vector operations instead of 2 * 7
integer operations.
Signed-off-by: Richard Henderson <address@hidden>
---
Changes in v2:
* Clarify some commentary.
* Remove unreachable out-of-line functions.
* Use more comparisons more favorable to x86_64,
and does not affect other vector hosts.
Example code generation (x86_64 and aarch64):
USHL:
0x564bc522df1b: c5 e9 ef d2 vpxor %xmm2, %xmm2, %xmm2
0x564bc522df1f: c5 e9 fa d1 vpsubd %xmm1, %xmm2, %xmm2
0x564bc522df23: c5 fa 7e 1d 75 00 00 00 vmovq 0x75(%rip), %xmm3
0x564bc522df2b: c5 f1 db cb vpand %xmm3, %xmm1, %xmm1
0x564bc522df2f: c5 e9 db d3 vpand %xmm3, %xmm2, %xmm2
0x564bc522df33: c4 e2 79 47 d9 vpsllvd %xmm1, %xmm0, %xmm3
0x564bc522df38: c4 e2 79 45 c2 vpsrlvd %xmm2, %xmm0, %xmm0
0x564bc522df3d: c5 fa 7e 25 63 00 00 00 vmovq 0x63(%rip), %xmm4
0x564bc522df45: c5 d9 66 c9 vpcmpgtd %xmm1, %xmm4, %xmm1
0x564bc522df49: c5 d9 66 d2 vpcmpgtd %xmm2, %xmm4, %xmm2
0x564bc522df4d: c5 e1 db c9 vpand %xmm1, %xmm3, %xmm1
0x564bc522df51: c5 f9 db c2 vpand %xmm2, %xmm0, %xmm0
0x564bc522df55: c5 f1 eb c0 vpor %xmm0, %xmm1, %xmm0
0xaaaac8a29414: 6ea0b822 neg v2.4s, v1.4s
0xaaaac8a29418: 6f00e623 movi v3.2d, #0x0000ff000000ff
0xaaaac8a2941c: 4e231c21 and v1.16b, v1.16b, v3.16b
0xaaaac8a29420: 4e231c42 and v2.16b, v2.16b, v3.16b
0xaaaac8a29424: 6ea14403 ushl v3.4s, v0.4s, v1.4s
0xaaaac8a29428: 6ea0b844 neg v4.4s, v2.4s
0xaaaac8a2942c: 6ea44400 ushl v0.4s, v0.4s, v4.4s
0xaaaac8a29430: 4f010404 movi v4.4s, #0x20
0xaaaac8a29434: 4ea13481 cmgt v1.4s, v4.4s, v1.4s
0xaaaac8a29438: 4ea23482 cmgt v2.4s, v4.4s, v2.4s
0xaaaac8a2943c: 4e211c61 and v1.16b, v3.16b, v1.16b
0xaaaac8a29440: 4e221c00 and v0.16b, v0.16b, v2.16b
0xaaaac8a29444: 4ea01c20 orr v0.16b, v1.16b, v0.16b
SSHL:
0x55787414385b: c5 e9 ef d2 vpxor %xmm2, %xmm2, %xmm2
0x55787414385f: c5 e9 fa d1 vpsubd %xmm1, %xmm2, %xmm2
0x557874143863: c4 e2 79 59 1d 7c 00 00 vpbroadcastq 0x7c(%rip), %xmm3
0x55787414386b: 00
0x55787414386c: c5 f1 db cb vpand %xmm3, %xmm1, %xmm1
0x557874143870: c5 e9 db d3 vpand %xmm3, %xmm2, %xmm2
0x557874143874: c4 e2 79 59 1d 7b 00 00 vpbroadcastq 0x7b(%rip), %xmm3
0x55787414387c: 00
0x55787414387d: c4 e2 69 3b d3 vpminud %xmm3, %xmm2, %xmm2
0x557874143882: c5 f1 66 db vpcmpgtd %xmm3, %xmm1, %xmm3
0x557874143886: c4 e2 79 47 e1 vpsllvd %xmm1, %xmm0, %xmm4
0x55787414388b: c4 e2 79 46 c2 vpsravd %xmm2, %xmm0, %xmm0
0x557874143890: c5 e1 df d4 vpandn %xmm4, %xmm3, %xmm2
0x557874143894: c4 e2 79 59 1d 53 00 00 vpbroadcastq 0x53(%rip), %xmm3
0x55787414389c: 00
0x55787414389d: c5 e1 66 c9 vpcmpgtd %xmm1, %xmm3, %xmm1
0x5578741438a1: c4 e3 79 4c c2 10 vpblendvb %xmm1, %xmm2, %xmm0, %xmm0
0xaaaab5996414: 6ea0b822 neg v2.4s, v1.4s
0xaaaab5996418: 6f00e623 movi v3.2d, #0x0000ff000000ff
0xaaaab599641c: 4e231c21 and v1.16b, v1.16b, v3.16b
0xaaaab5996420: 4e231c42 and v2.16b, v2.16b, v3.16b
0xaaaab5996424: 4f0007e3 movi v3.4s, #0x1f
0xaaaab5996428: 6ea36c42 umin v2.4s, v2.4s, v3.4s
0xaaaab599642c: 4ea33423 cmgt v3.4s, v1.4s, v3.4s
0xaaaab5996430: 6ea14404 ushl v4.4s, v0.4s, v1.4s
0xaaaab5996434: 6ea0b842 neg v2.4s, v2.4s
0xaaaab5996438: 4ea24400 sshl v0.4s, v0.4s, v2.4s
0xaaaab599643c: 4e631c82 bic v2.16b, v4.16b, v3.16b
0xaaaab5996440: 4f040403 movi v3.4s, #0x80
0xaaaab5996444: 4ea13461 cmgt v1.4s, v3.4s, v1.4s
0xaaaab5996448: 6ea11c40 bit v0.16b, v2.16b, v1.16b
r~
---
target/arm/helper.h | 11 +-
target/arm/translate.h | 6 +
target/arm/neon_helper.c | 33 ----
target/arm/translate-a64.c | 18 +--
target/arm/translate.c | 300 +++++++++++++++++++++++++++++++++++--
target/arm/vec_helper.c | 88 +++++++++++
6 files changed, 390 insertions(+), 66 deletions(-)
diff --git a/target/arm/helper.h b/target/arm/helper.h
index 132aa1682e..1ab0fe597a 100644
--- a/target/arm/helper.h
+++ b/target/arm/helper.h
@@ -297,14 +297,8 @@ DEF_HELPER_2(neon_abd_s16, i32, i32, i32)
DEF_HELPER_2(neon_abd_u32, i32, i32, i32)
DEF_HELPER_2(neon_abd_s32, i32, i32, i32)
-DEF_HELPER_2(neon_shl_u8, i32, i32, i32)
-DEF_HELPER_2(neon_shl_s8, i32, i32, i32)
DEF_HELPER_2(neon_shl_u16, i32, i32, i32)
DEF_HELPER_2(neon_shl_s16, i32, i32, i32)
-DEF_HELPER_2(neon_shl_u32, i32, i32, i32)
-DEF_HELPER_2(neon_shl_s32, i32, i32, i32)
-DEF_HELPER_2(neon_shl_u64, i64, i64, i64)
-DEF_HELPER_2(neon_shl_s64, i64, i64, i64)
DEF_HELPER_2(neon_rshl_u8, i32, i32, i32)
DEF_HELPER_2(neon_rshl_s8, i32, i32, i32)
DEF_HELPER_2(neon_rshl_u16, i32, i32, i32)
@@ -691,6 +685,11 @@ DEF_HELPER_FLAGS_2(frint64_s, TCG_CALL_NO_RWG, f32, f32,
ptr)
DEF_HELPER_FLAGS_2(frint32_d, TCG_CALL_NO_RWG, f64, f64, ptr)
DEF_HELPER_FLAGS_2(frint64_d, TCG_CALL_NO_RWG, f64, f64, ptr)
+DEF_HELPER_FLAGS_4(gvec_sshl_b, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(gvec_sshl_h, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(gvec_ushl_b, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
+DEF_HELPER_FLAGS_4(gvec_ushl_h, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, i32)
+
#ifdef TARGET_AARCH64
#include "helper-a64.h"
#include "helper-sve.h"
diff --git a/target/arm/translate.h b/target/arm/translate.h
index dc06dce767..01ae454dcf 100644
--- a/target/arm/translate.h
+++ b/target/arm/translate.h
@@ -241,6 +241,8 @@ static inline void gen_ss_advance(DisasContext *s)
extern const GVecGen3 mla_op[4];
extern const GVecGen3 mls_op[4];
extern const GVecGen3 cmtst_op[4];
+extern const GVecGen3 sshl_op[4];
+extern const GVecGen3 ushl_op[4];
extern const GVecGen2i ssra_op[4];
extern const GVecGen2i usra_op[4];
extern const GVecGen2i sri_op[4];
@@ -250,6 +252,10 @@ extern const GVecGen4 sqadd_op[4];
extern const GVecGen4 uqsub_op[4];
extern const GVecGen4 sqsub_op[4];
void gen_cmtst_i64(TCGv_i64 d, TCGv_i64 a, TCGv_i64 b);
+void gen_ushl_i32(TCGv_i32 d, TCGv_i32 a, TCGv_i32 b);
+void gen_sshl_i32(TCGv_i32 d, TCGv_i32 a, TCGv_i32 b);
+void gen_ushl_i64(TCGv_i64 d, TCGv_i64 a, TCGv_i64 b);
+void gen_sshl_i64(TCGv_i64 d, TCGv_i64 a, TCGv_i64 b);
/*
* Forward to the isar_feature_* tests given a DisasContext pointer.
diff --git a/target/arm/neon_helper.c b/target/arm/neon_helper.c
index 4259056723..c581ffb7d3 100644
--- a/target/arm/neon_helper.c
+++ b/target/arm/neon_helper.c
@@ -615,24 +615,9 @@ NEON_VOP(abd_u32, neon_u32, 1)
} else { \
dest = src1 << tmp; \
}} while (0)
-NEON_VOP(shl_u8, neon_u8, 4)
NEON_VOP(shl_u16, neon_u16, 2)
-NEON_VOP(shl_u32, neon_u32, 1)
#undef NEON_FN
-uint64_t HELPER(neon_shl_u64)(uint64_t val, uint64_t shiftop)
-{
- int8_t shift = (int8_t)shiftop;
- if (shift >= 64 || shift <= -64) {
- val = 0;
- } else if (shift < 0) {
- val >>= -shift;
- } else {
- val <<= shift;
- }
- return val;
-}
-
#define NEON_FN(dest, src1, src2) do { \
int8_t tmp; \
tmp = (int8_t)src2; \
@@ -645,27 +630,9 @@ uint64_t HELPER(neon_shl_u64)(uint64_t val, uint64_t
shiftop)
} else { \
dest = src1 << tmp; \
}} while (0)
-NEON_VOP(shl_s8, neon_s8, 4)
NEON_VOP(shl_s16, neon_s16, 2)
-NEON_VOP(shl_s32, neon_s32, 1)
#undef NEON_FN
-uint64_t HELPER(neon_shl_s64)(uint64_t valop, uint64_t shiftop)
-{
- int8_t shift = (int8_t)shiftop;
- int64_t val = valop;
- if (shift >= 64) {
- val = 0;
- } else if (shift <= -64) {
- val >>= 63;
- } else if (shift < 0) {
- val >>= -shift;
- } else {
- val <<= shift;
- }
- return val;
-}
-
#define NEON_FN(dest, src1, src2) do { \
int8_t tmp; \
tmp = (int8_t)src2; \
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index d7d1ef088f..9a308db97e 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -8856,9 +8856,9 @@ static void handle_3same_64(DisasContext *s, int opcode,
bool u,
break;
case 0x8: /* SSHL, USHL */
if (u) {
- gen_helper_neon_shl_u64(tcg_rd, tcg_rn, tcg_rm);
+ gen_ushl_i64(tcg_rd, tcg_rn, tcg_rm);
} else {
- gen_helper_neon_shl_s64(tcg_rd, tcg_rn, tcg_rm);
+ gen_sshl_i64(tcg_rd, tcg_rn, tcg_rm);
}
break;
case 0x9: /* SQSHL, UQSHL */
@@ -11253,6 +11253,10 @@ static void disas_simd_3same_int(DisasContext *s,
uint32_t insn)
is_q ? 16 : 8, vec_full_reg_size(s),
(u ? uqsub_op : sqsub_op) + size);
return;
+ case 0x08: /* SSHL, USHL */
+ gen_gvec_op3(s, is_q, rd, rn, rm,
+ u ? &ushl_op[size] : &sshl_op[size]);
+ return;
case 0x0c: /* SMAX, UMAX */
if (u) {
gen_gvec_fn3(s, is_q, rd, rn, rm, tcg_gen_gvec_umax, size);
@@ -11368,16 +11372,6 @@ static void disas_simd_3same_int(DisasContext *s,
uint32_t insn)
genfn = fns[size][u];
break;
}
- case 0x8: /* SSHL, USHL */
- {
- static NeonGenTwoOpFn * const fns[3][2] = {
- { gen_helper_neon_shl_s8, gen_helper_neon_shl_u8 },
- { gen_helper_neon_shl_s16, gen_helper_neon_shl_u16 },
- { gen_helper_neon_shl_s32, gen_helper_neon_shl_u32 },
- };
- genfn = fns[size][u];
- break;
- }
case 0x9: /* SQSHL, UQSHL */
{
static NeonGenTwoOpEnvFn * const fns[3][2] = {
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 83b4d858af..ed9cd1e590 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -5374,13 +5374,13 @@ static inline void gen_neon_shift_narrow(int size,
TCGv_i32 var, TCGv_i32 shift,
if (u) {
switch (size) {
case 1: gen_helper_neon_shl_u16(var, var, shift); break;
- case 2: gen_helper_neon_shl_u32(var, var, shift); break;
+ case 2: gen_ushl_i32(var, var, shift); break;
default: abort();
}
} else {
switch (size) {
case 1: gen_helper_neon_shl_s16(var, var, shift); break;
- case 2: gen_helper_neon_shl_s32(var, var, shift); break;
+ case 2: gen_sshl_i32(var, var, shift); break;
default: abort();
}
}
@@ -6193,6 +6193,282 @@ const GVecGen3 cmtst_op[4] = {
.vece = MO_64 },
};
+void gen_ushl_i32(TCGv_i32 d, TCGv_i32 a, TCGv_i32 b)
+{
+ TCGv_i32 lval = tcg_temp_new_i32();
+ TCGv_i32 rval = tcg_temp_new_i32();
+ TCGv_i32 lsh = tcg_temp_new_i32();
+ TCGv_i32 rsh = tcg_temp_new_i32();
+ TCGv_i32 zero = tcg_const_i32(0);
+ TCGv_i32 max = tcg_const_i32(32);
+
+ /*
+ * Rely on the TCG guarantee that out of range shifts produce
+ * unspecified results, not undefined behaviour (i.e. no trap).
+ * Discard out-of-range results after the fact.
+ */
+ tcg_gen_ext8s_i32(lsh, b);
+ tcg_gen_neg_i32(rsh, lsh);
+ tcg_gen_shl_i32(lval, a, lsh);
+ tcg_gen_shr_i32(rval, a, rsh);
+ tcg_gen_movcond_i32(TCG_COND_LTU, d, lsh, max, lval, zero);
+ tcg_gen_movcond_i32(TCG_COND_LTU, d, rsh, max, rval, d);
+
+ tcg_temp_free_i32(lval);
+ tcg_temp_free_i32(rval);
+ tcg_temp_free_i32(lsh);
+ tcg_temp_free_i32(rsh);
+ tcg_temp_free_i32(zero);
+ tcg_temp_free_i32(max);
+}
+
+void gen_ushl_i64(TCGv_i64 d, TCGv_i64 a, TCGv_i64 b)
+{
+ TCGv_i64 lval = tcg_temp_new_i64();
+ TCGv_i64 rval = tcg_temp_new_i64();
+ TCGv_i64 lsh = tcg_temp_new_i64();
+ TCGv_i64 rsh = tcg_temp_new_i64();
+ TCGv_i64 zero = tcg_const_i64(0);
+ TCGv_i64 max = tcg_const_i64(64);
+
+ /*
+ * Rely on the TCG guarantee that out of range shifts produce
+ * unspecified results, not undefined behaviour (i.e. no trap).
+ * Discard out-of-range results after the fact.
+ */
+ tcg_gen_ext8s_i64(lsh, b);
+ tcg_gen_neg_i64(rsh, lsh);
+ tcg_gen_shl_i64(lval, a, lsh);
+ tcg_gen_shr_i64(rval, a, rsh);
+ tcg_gen_movcond_i64(TCG_COND_LTU, d, lsh, max, lval, zero);
+ tcg_gen_movcond_i64(TCG_COND_LTU, d, rsh, max, rval, d);
+
+ tcg_temp_free_i64(lval);
+ tcg_temp_free_i64(rval);
+ tcg_temp_free_i64(lsh);
+ tcg_temp_free_i64(rsh);
+ tcg_temp_free_i64(zero);
+ tcg_temp_free_i64(max);
+}
+
+static void gen_ushl_vec(unsigned vece, TCGv_vec d, TCGv_vec a, TCGv_vec b)
+{
+ TCGv_vec lval = tcg_temp_new_vec_matching(d);
+ TCGv_vec rval = tcg_temp_new_vec_matching(d);
+ TCGv_vec lsh = tcg_temp_new_vec_matching(d);
+ TCGv_vec rsh = tcg_temp_new_vec_matching(d);
+ TCGv_vec msk, max;
+
+ /*
+ * Rely on the TCG guarantee that out of range shifts produce
+ * unspecified results, not undefined behaviour (i.e. no trap).
+ * Discard out-of-range results after the fact.
+ */
+ tcg_gen_neg_vec(vece, rsh, b);
+ if (vece == MO_8) {
+ tcg_gen_mov_vec(lsh, b);
+ } else {
+ msk = tcg_temp_new_vec_matching(d);
+ tcg_gen_dupi_vec(vece, msk, 0xff);
+ tcg_gen_and_vec(vece, lsh, b, msk);
+ tcg_gen_and_vec(vece, rsh, rsh, msk);
+ tcg_temp_free_vec(msk);
+ }
+
+ /*
+ * Perform possibly out of range shifts, trusting that the operation
+ * does not trap. Discard unused results after the fact.
+ */
+ tcg_gen_shlv_vec(vece, lval, a, lsh);
+ tcg_gen_shrv_vec(vece, rval, a, rsh);
+
+ max = tcg_temp_new_vec_matching(d);
+ tcg_gen_dupi_vec(vece, max, 8 << vece);
+
+ /*
+ * The choice of LT (signed) and GEU (unsigned) are biased toward
+ * the instructions of the x86_64 host. For MO_8, the whole byte
+ * is significant so we must use an unsigned compare; otherwise we
+ * have already masked to a byte and so a signed compare works.
+ * Other tcg hosts have a full set of comparisons and do not care.
+ */
+ if (vece == MO_8) {
+ tcg_gen_cmp_vec(TCG_COND_GEU, vece, lsh, lsh, max);
+ tcg_gen_cmp_vec(TCG_COND_GEU, vece, rsh, rsh, max);
+ tcg_gen_andc_vec(vece, lval, lval, lsh);
+ tcg_gen_andc_vec(vece, rval, rval, rsh);
+ } else {
+ tcg_gen_cmp_vec(TCG_COND_LT, vece, lsh, lsh, max);
+ tcg_gen_cmp_vec(TCG_COND_LT, vece, rsh, rsh, max);
+ tcg_gen_and_vec(vece, lval, lval, lsh);
+ tcg_gen_and_vec(vece, rval, rval, rsh);
+ }
+ tcg_gen_or_vec(vece, d, lval, rval);
+
+ tcg_temp_free_vec(max);
+ tcg_temp_free_vec(lval);
+ tcg_temp_free_vec(rval);
+ tcg_temp_free_vec(lsh);
+ tcg_temp_free_vec(rsh);
+}
+
+static const TCGOpcode ushl_list[] = {
+ INDEX_op_neg_vec, INDEX_op_shlv_vec,
+ INDEX_op_shrv_vec, INDEX_op_cmp_vec, 0
+};
+
+const GVecGen3 ushl_op[4] = {
+ { .fniv = gen_ushl_vec,
+ .fno = gen_helper_gvec_ushl_b,
+ .opt_opc = ushl_list,
+ .vece = MO_8 },
+ { .fniv = gen_ushl_vec,
+ .fno = gen_helper_gvec_ushl_h,
+ .opt_opc = ushl_list,
+ .vece = MO_16 },
+ { .fni4 = gen_ushl_i32,
+ .fniv = gen_ushl_vec,
+ .opt_opc = ushl_list,
+ .vece = MO_32 },
+ { .fni8 = gen_ushl_i64,
+ .fniv = gen_ushl_vec,
+ .opt_opc = ushl_list,
+ .vece = MO_64 },
+};
+
+void gen_sshl_i32(TCGv_i32 d, TCGv_i32 a, TCGv_i32 b)
+{
+ TCGv_i32 lval = tcg_temp_new_i32();
+ TCGv_i32 rval = tcg_temp_new_i32();
+ TCGv_i32 lsh = tcg_temp_new_i32();
+ TCGv_i32 rsh = tcg_temp_new_i32();
+ TCGv_i32 zero = tcg_const_i32(0);
+ TCGv_i32 max = tcg_const_i32(31);
+
+ /*
+ * Rely on the TCG guarantee that out of range shifts produce
+ * unspecified results, not undefined behaviour (i.e. no trap).
+ * Discard out-of-range results after the fact.
+ */
+ tcg_gen_ext8s_i32(lsh, b);
+ tcg_gen_neg_i32(rsh, lsh);
+ tcg_gen_shl_i32(lval, a, lsh);
+ tcg_gen_umin_i32(rsh, rsh, max);
+ tcg_gen_sar_i32(rval, a, rsh);
+ tcg_gen_movcond_i32(TCG_COND_LEU, lval, lsh, max, lval, zero);
+ tcg_gen_movcond_i32(TCG_COND_LT, d, lsh, zero, rval, lval);
+
+ tcg_temp_free_i32(lval);
+ tcg_temp_free_i32(rval);
+ tcg_temp_free_i32(lsh);
+ tcg_temp_free_i32(rsh);
+ tcg_temp_free_i32(zero);
+ tcg_temp_free_i32(max);
+}
+
+void gen_sshl_i64(TCGv_i64 d, TCGv_i64 a, TCGv_i64 b)
+{
+ TCGv_i64 lval = tcg_temp_new_i64();
+ TCGv_i64 rval = tcg_temp_new_i64();
+ TCGv_i64 lsh = tcg_temp_new_i64();
+ TCGv_i64 rsh = tcg_temp_new_i64();
+ TCGv_i64 zero = tcg_const_i64(0);
+ TCGv_i64 max = tcg_const_i64(63);
+
+ /*
+ * Rely on the TCG guarantee that out of range shifts produce
+ * unspecified results, not undefined behaviour (i.e. no trap).
+ * Discard out-of-range results after the fact.
+ */
+ tcg_gen_ext8s_i64(lsh, b);
+ tcg_gen_neg_i64(rsh, lsh);
+ tcg_gen_shl_i64(lval, a, lsh);
+ tcg_gen_umin_i64(rsh, rsh, max);
+ tcg_gen_sar_i64(rval, a, rsh);
+ tcg_gen_movcond_i64(TCG_COND_LEU, lval, lsh, max, lval, zero);
+ tcg_gen_movcond_i64(TCG_COND_LT, d, lsh, zero, rval, lval);
+
+ tcg_temp_free_i64(lval);
+ tcg_temp_free_i64(rval);
+ tcg_temp_free_i64(lsh);
+ tcg_temp_free_i64(rsh);
+ tcg_temp_free_i64(zero);
+ tcg_temp_free_i64(max);
+}
+
+static void gen_sshl_vec(unsigned vece, TCGv_vec d, TCGv_vec a, TCGv_vec b)
+{
+ TCGv_vec lval = tcg_temp_new_vec_matching(d);
+ TCGv_vec rval = tcg_temp_new_vec_matching(d);
+ TCGv_vec lsh = tcg_temp_new_vec_matching(d);
+ TCGv_vec rsh = tcg_temp_new_vec_matching(d);
+ TCGv_vec tmp = tcg_temp_new_vec_matching(d);
+
+ /*
+ * Rely on the TCG guarantee that out of range shifts produce
+ * unspecified results, not undefined behaviour (i.e. no trap).
+ * Discard out-of-range results after the fact.
+ */
+ tcg_gen_neg_vec(vece, rsh, b);
+ if (vece == MO_8) {
+ tcg_gen_mov_vec(lsh, b);
+ } else {
+ tcg_gen_dupi_vec(vece, tmp, 0xff);
+ tcg_gen_and_vec(vece, lsh, b, tmp);
+ tcg_gen_and_vec(vece, rsh, rsh, tmp);
+ }
+
+ /* Bound rsh so out of bound right shift gets -1. */
+ tcg_gen_dupi_vec(vece, tmp, (8 << vece) - 1);
+ tcg_gen_umin_vec(vece, rsh, rsh, tmp);
+ tcg_gen_cmp_vec(TCG_COND_GT, vece, tmp, lsh, tmp);
+
+ tcg_gen_shlv_vec(vece, lval, a, lsh);
+ tcg_gen_sarv_vec(vece, rval, a, rsh);
+
+ /* Select in-bound left shift. */
+ tcg_gen_andc_vec(vece, lval, lval, tmp);
+
+ /* Select between left and right shift. */
+ if (vece == MO_8) {
+ tcg_gen_dupi_vec(vece, tmp, 0);
+ tcg_gen_cmpsel_vec(TCG_COND_LT, vece, d, lsh, tmp, rval, lval);
+ } else {
+ tcg_gen_dupi_vec(vece, tmp, 0x80);
+ tcg_gen_cmpsel_vec(TCG_COND_LT, vece, d, lsh, tmp, lval, rval);
+ }
+
+ tcg_temp_free_vec(lval);
+ tcg_temp_free_vec(rval);
+ tcg_temp_free_vec(lsh);
+ tcg_temp_free_vec(rsh);
+ tcg_temp_free_vec(tmp);
+}
+
+static const TCGOpcode sshl_list[] = {
+ INDEX_op_neg_vec, INDEX_op_umin_vec, INDEX_op_shlv_vec,
+ INDEX_op_sarv_vec, INDEX_op_cmp_vec, INDEX_op_cmpsel_vec, 0
+};
+
+const GVecGen3 sshl_op[4] = {
+ { .fniv = gen_sshl_vec,
+ .fno = gen_helper_gvec_sshl_b,
+ .opt_opc = sshl_list,
+ .vece = MO_8 },
+ { .fniv = gen_sshl_vec,
+ .fno = gen_helper_gvec_sshl_h,
+ .opt_opc = sshl_list,
+ .vece = MO_16 },
+ { .fni4 = gen_sshl_i32,
+ .fniv = gen_sshl_vec,
+ .opt_opc = sshl_list,
+ .vece = MO_32 },
+ { .fni8 = gen_sshl_i64,
+ .fniv = gen_sshl_vec,
+ .opt_opc = sshl_list,
+ .vece = MO_64 },
+};
+
static void gen_uqadd_vec(unsigned vece, TCGv_vec t, TCGv_vec sat,
TCGv_vec a, TCGv_vec b)
{
@@ -6596,6 +6872,11 @@ static int disas_neon_data_insn(DisasContext *s,
uint32_t insn)
vec_size, vec_size);
}
return 0;
+
+ case NEON_3R_VSHL:
+ tcg_gen_gvec_3(rd_ofs, rn_ofs, rm_ofs, vec_size, vec_size,
+ u ? &ushl_op[size] : &sshl_op[size]);
+ return 0;
}
if (size == 3) {
@@ -6604,13 +6885,6 @@ static int disas_neon_data_insn(DisasContext *s,
uint32_t insn)
neon_load_reg64(cpu_V0, rn + pass);
neon_load_reg64(cpu_V1, rm + pass);
switch (op) {
- case NEON_3R_VSHL:
- if (u) {
- gen_helper_neon_shl_u64(cpu_V0, cpu_V1, cpu_V0);
- } else {
- gen_helper_neon_shl_s64(cpu_V0, cpu_V1, cpu_V0);
- }
- break;
case NEON_3R_VQSHL:
if (u) {
gen_helper_neon_qshl_u64(cpu_V0, cpu_env,
@@ -6645,7 +6919,6 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t
insn)
}
pairwise = 0;
switch (op) {
- case NEON_3R_VSHL:
case NEON_3R_VQSHL:
case NEON_3R_VRSHL:
case NEON_3R_VQRSHL:
@@ -6725,9 +6998,6 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t
insn)
case NEON_3R_VHSUB:
GEN_NEON_INTEGER_OP(hsub);
break;
- case NEON_3R_VSHL:
- GEN_NEON_INTEGER_OP(shl);
- break;
case NEON_3R_VQSHL:
GEN_NEON_INTEGER_OP_ENV(qshl);
break;
@@ -7136,9 +7406,9 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t
insn)
}
} else {
if (input_unsigned) {
- gen_helper_neon_shl_u64(cpu_V0, in, tmp64);
+ gen_ushl_i64(cpu_V0, in, tmp64);
} else {
- gen_helper_neon_shl_s64(cpu_V0, in, tmp64);
+ gen_sshl_i64(cpu_V0, in, tmp64);
}
}
tmp = tcg_temp_new_i32();
diff --git a/target/arm/vec_helper.c b/target/arm/vec_helper.c
index dedef62403..fcb3663903 100644
--- a/target/arm/vec_helper.c
+++ b/target/arm/vec_helper.c
@@ -1046,3 +1046,91 @@ void HELPER(gvec_fmlal_idx_a64)(void *vd, void *vn, void
*vm,
do_fmlal_idx(vd, vn, vm, &env->vfp.fp_status, desc,
get_flush_inputs_to_zero(&env->vfp.fp_status_f16));
}
+
+void HELPER(gvec_sshl_b)(void *vd, void *vn, void *vm, uint32_t desc)
+{
+ intptr_t i, opr_sz = simd_oprsz(desc);
+ int8_t *d = vd, *n = vn, *m = vm;
+
+ for (i = 0; i < opr_sz; ++i) {
+ int8_t mm = m[i];
+ int8_t nn = n[i];
+ int8_t res = 0;
+ if (mm >= 0) {
+ if (mm < 8) {
+ res = nn << mm;
+ }
+ } else {
+ res = nn >> (mm > -8 ? -mm : 7);
+ }
+ d[i] = res;
+ }
+ clear_tail(d, opr_sz, simd_maxsz(desc));
+}
+
+void HELPER(gvec_sshl_h)(void *vd, void *vn, void *vm, uint32_t desc)
+{
+ intptr_t i, opr_sz = simd_oprsz(desc);
+ int16_t *d = vd, *n = vn, *m = vm;
+
+ for (i = 0; i < opr_sz / 2; ++i) {
+ int8_t mm = m[i]; /* only 8 bits of shift are significant */
+ int16_t nn = n[i];
+ int16_t res = 0;
+ if (mm >= 0) {
+ if (mm < 16) {
+ res = nn << mm;
+ }
+ } else {
+ res = nn >> (mm > -16 ? -mm : 15);
+ }
+ d[i] = res;
+ }
+ clear_tail(d, opr_sz, simd_maxsz(desc));
+}
+
+void HELPER(gvec_ushl_b)(void *vd, void *vn, void *vm, uint32_t desc)
+{
+ intptr_t i, opr_sz = simd_oprsz(desc);
+ uint8_t *d = vd, *n = vn, *m = vm;
+
+ for (i = 0; i < opr_sz; ++i) {
+ int8_t mm = m[i];
+ uint8_t nn = n[i];
+ uint8_t res = 0;
+ if (mm >= 0) {
+ if (mm < 8) {
+ res = nn << mm;
+ }
+ } else {
+ if (mm > -8) {
+ res = nn >> -mm;
+ }
+ }
+ d[i] = res;
+ }
+ clear_tail(d, opr_sz, simd_maxsz(desc));
+}
+
+void HELPER(gvec_ushl_h)(void *vd, void *vn, void *vm, uint32_t desc)
+{
+ intptr_t i, opr_sz = simd_oprsz(desc);
+ uint16_t *d = vd, *n = vn, *m = vm;
+
+ for (i = 0; i < opr_sz / 2; ++i) {
+ int8_t mm = m[i]; /* only 8 bits of shift are significant */
+ uint16_t nn = n[i];
+ uint16_t res = 0;
+ if (mm >= 0) {
+ if (mm < 16) {
+ res = nn << mm;
+ }
+ } else {
+ if (mm > -16) {
+ res = nn >> -mm;
+ }
+ }
+ d[i] = res;
+ }
+ clear_tail(d, opr_sz, simd_maxsz(desc));
+}
--
2.17.1
- [Qemu-devel] [PATCH v2] target/arm: Vectorize USHL and SSHL,
Richard Henderson <=