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[Qemu-arm] [PATCH 5/5] target/arm: Handle SVE registers when using clear
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From: |
Richard Henderson |
|
Subject: |
[Qemu-arm] [PATCH 5/5] target/arm: Handle SVE registers when using clear_vec_high |
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Date: |
Sat, 10 Feb 2018 15:05:30 -0800 |
When storing to an AdvSIMD FP register, all of the high
bits of the SVE register are zeroed. Therefore, call it
more often with is_q as a parameter.
Signed-off-by: Richard Henderson <address@hidden>
---
target/arm/translate-a64.c | 162 +++++++++++++++++----------------------------
1 file changed, 62 insertions(+), 100 deletions(-)
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index e3881d4999..1c88539d62 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -602,13 +602,30 @@ static TCGv_i32 read_fp_sreg(DisasContext *s, int reg)
return v;
}
+/* Clear the bits above an N-bit vector, for N = (is_q ? 128 : 64).
+ * If SVE is not enabled, then there are only 128 bits in the vector.
+ */
+static void clear_vec_high(DisasContext *s, bool is_q, int rd)
+{
+ unsigned ofs = fp_reg_offset(s, rd, MO_64);
+ unsigned vsz = vec_full_reg_size(s);
+
+ if (!is_q) {
+ TCGv_i64 tcg_zero = tcg_const_i64(0);
+ tcg_gen_st_i64(tcg_zero, cpu_env, ofs + 8);
+ tcg_temp_free_i64(tcg_zero);
+ }
+ if (vsz > 16) {
+ tcg_gen_gvec_dup8i(ofs + 16, vsz - 16, vsz - 16, 0);
+ }
+}
+
static void write_fp_dreg(DisasContext *s, int reg, TCGv_i64 v)
{
- TCGv_i64 tcg_zero = tcg_const_i64(0);
+ unsigned ofs = fp_reg_offset(s, reg, MO_64);
- tcg_gen_st_i64(v, cpu_env, fp_reg_offset(s, reg, MO_64));
- tcg_gen_st_i64(tcg_zero, cpu_env, fp_reg_hi_offset(s, reg));
- tcg_temp_free_i64(tcg_zero);
+ tcg_gen_st_i64(v, cpu_env, ofs);
+ clear_vec_high(s, false, reg);
}
static void write_fp_sreg(DisasContext *s, int reg, TCGv_i32 v)
@@ -1009,6 +1026,8 @@ static void do_fp_ld(DisasContext *s, int destidx,
TCGv_i64 tcg_addr, int size)
tcg_temp_free_i64(tmplo);
tcg_temp_free_i64(tmphi);
+
+ clear_vec_high(s, true, destidx);
}
/*
@@ -1124,17 +1143,6 @@ static void write_vec_element_i32(DisasContext *s,
TCGv_i32 tcg_src,
}
}
-/* Clear the high 64 bits of a 128 bit vector (in general non-quad
- * vector ops all need to do this).
- */
-static void clear_vec_high(DisasContext *s, int rd)
-{
- TCGv_i64 tcg_zero = tcg_const_i64(0);
-
- write_vec_element(s, tcg_zero, rd, 1, MO_64);
- tcg_temp_free_i64(tcg_zero);
-}
-
/* Store from vector register to memory */
static void do_vec_st(DisasContext *s, int srcidx, int element,
TCGv_i64 tcg_addr, int size)
@@ -2794,12 +2802,13 @@ static void disas_ldst_multiple_struct(DisasContext *s,
uint32_t insn)
/* For non-quad operations, setting a slice of the low
* 64 bits of the register clears the high 64 bits (in
* the ARM ARM pseudocode this is implicit in the fact
- * that 'rval' is a 64 bit wide variable). We optimize
- * by noticing that we only need to do this the first
- * time we touch a register.
+ * that 'rval' is a 64 bit wide variable).
+ * For quad operations, we might still need to zero the
+ * high bits of SVE. We optimize by noticing that we only
+ * need to do this the first time we touch a register.
*/
- if (!is_q && e == 0 && (r == 0 || xs == selem - 1)) {
- clear_vec_high(s, tt);
+ if (e == 0 && (r == 0 || xs == selem - 1)) {
+ clear_vec_high(s, is_q, tt);
}
}
tcg_gen_addi_i64(tcg_addr, tcg_addr, ebytes);
@@ -2942,10 +2951,9 @@ static void disas_ldst_single_struct(DisasContext *s,
uint32_t insn)
write_vec_element(s, tcg_tmp, rt, 0, MO_64);
if (is_q) {
write_vec_element(s, tcg_tmp, rt, 1, MO_64);
- } else {
- clear_vec_high(s, rt);
}
tcg_temp_free_i64(tcg_tmp);
+ clear_vec_high(s, is_q, rt);
} else {
/* Load/store one element per register */
if (is_load) {
@@ -6718,7 +6726,6 @@ static void handle_vec_simd_sqshrn(DisasContext *s, bool
is_scalar, bool is_q,
}
if (!is_q) {
- clear_vec_high(s, rd);
write_vec_element(s, tcg_final, rd, 0, MO_64);
} else {
write_vec_element(s, tcg_final, rd, 1, MO_64);
@@ -6731,7 +6738,8 @@ static void handle_vec_simd_sqshrn(DisasContext *s, bool
is_scalar, bool is_q,
tcg_temp_free_i64(tcg_rd);
tcg_temp_free_i32(tcg_rd_narrowed);
tcg_temp_free_i64(tcg_final);
- return;
+
+ clear_vec_high(s, is_q, rd);
}
/* SQSHLU, UQSHL, SQSHL: saturating left shifts */
@@ -6795,10 +6803,7 @@ static void handle_simd_qshl(DisasContext *s, bool
scalar, bool is_q,
tcg_temp_free_i64(tcg_op);
}
tcg_temp_free_i64(tcg_shift);
-
- if (!is_q) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, is_q, rd);
} else {
TCGv_i32 tcg_shift = tcg_const_i32(shift);
static NeonGenTwoOpEnvFn * const fns[2][2][3] = {
@@ -6847,8 +6852,8 @@ static void handle_simd_qshl(DisasContext *s, bool
scalar, bool is_q,
}
tcg_temp_free_i32(tcg_shift);
- if (!is_q && !scalar) {
- clear_vec_high(s, rd);
+ if (!scalar) {
+ clear_vec_high(s, is_q, rd);
}
}
}
@@ -6901,13 +6906,11 @@ static void handle_simd_intfp_conv(DisasContext *s, int
rd, int rn,
}
}
- if (!is_double && elements == 2) {
- clear_vec_high(s, rd);
- }
-
tcg_temp_free_i64(tcg_int);
tcg_temp_free_ptr(tcg_fpst);
tcg_temp_free_i32(tcg_shift);
+
+ clear_vec_high(s, elements << size == 16, rd);
}
/* UCVTF/SCVTF - Integer to FP conversion */
@@ -6995,9 +6998,7 @@ static void handle_simd_shift_fpint_conv(DisasContext *s,
bool is_scalar,
write_vec_element(s, tcg_op, rd, pass, MO_64);
tcg_temp_free_i64(tcg_op);
}
- if (!is_q) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, is_q, rd);
} else {
int maxpass = is_scalar ? 1 : is_q ? 4 : 2;
for (pass = 0; pass < maxpass; pass++) {
@@ -7016,8 +7017,8 @@ static void handle_simd_shift_fpint_conv(DisasContext *s,
bool is_scalar,
}
tcg_temp_free_i32(tcg_op);
}
- if (!is_q && !is_scalar) {
- clear_vec_high(s, rd);
+ if (!is_scalar) {
+ clear_vec_high(s, is_q, rd);
}
}
@@ -7502,10 +7503,7 @@ static void handle_3same_float(DisasContext *s, int
size, int elements,
tcg_temp_free_ptr(fpst);
- if ((elements << size) < 4) {
- /* scalar, or non-quad vector op */
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, elements * (size ? 8 : 4) > 8, rd);
}
/* AdvSIMD scalar three same
@@ -7831,13 +7829,11 @@ static void handle_2misc_fcmp_zero(DisasContext *s, int
opcode,
}
write_vec_element(s, tcg_res, rd, pass, MO_64);
}
- if (is_scalar) {
- clear_vec_high(s, rd);
- }
-
tcg_temp_free_i64(tcg_res);
tcg_temp_free_i64(tcg_zero);
tcg_temp_free_i64(tcg_op);
+
+ clear_vec_high(s, !is_scalar, rd);
} else {
TCGv_i32 tcg_op = tcg_temp_new_i32();
TCGv_i32 tcg_zero = tcg_const_i32(0);
@@ -7888,8 +7884,8 @@ static void handle_2misc_fcmp_zero(DisasContext *s, int
opcode,
tcg_temp_free_i32(tcg_res);
tcg_temp_free_i32(tcg_zero);
tcg_temp_free_i32(tcg_op);
- if (!is_q && !is_scalar) {
- clear_vec_high(s, rd);
+ if (!is_scalar) {
+ clear_vec_high(s, is_q, rd);
}
}
@@ -7925,12 +7921,9 @@ static void handle_2misc_reciprocal(DisasContext *s, int
opcode,
}
write_vec_element(s, tcg_res, rd, pass, MO_64);
}
- if (is_scalar) {
- clear_vec_high(s, rd);
- }
-
tcg_temp_free_i64(tcg_res);
tcg_temp_free_i64(tcg_op);
+ clear_vec_high(s, !is_scalar, rd);
} else {
TCGv_i32 tcg_op = tcg_temp_new_i32();
TCGv_i32 tcg_res = tcg_temp_new_i32();
@@ -7970,8 +7963,8 @@ static void handle_2misc_reciprocal(DisasContext *s, int
opcode,
}
tcg_temp_free_i32(tcg_res);
tcg_temp_free_i32(tcg_op);
- if (!is_q && !is_scalar) {
- clear_vec_high(s, rd);
+ if (!is_scalar) {
+ clear_vec_high(s, is_q, rd);
}
}
tcg_temp_free_ptr(fpst);
@@ -8077,9 +8070,7 @@ static void handle_2misc_narrow(DisasContext *s, bool
scalar,
write_vec_element_i32(s, tcg_res[pass], rd, destelt + pass, MO_32);
tcg_temp_free_i32(tcg_res[pass]);
}
- if (!is_q) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, is_q, rd);
}
/* Remaining saturating accumulating ops */
@@ -8104,12 +8095,9 @@ static void handle_2misc_satacc(DisasContext *s, bool
is_scalar, bool is_u,
}
write_vec_element(s, tcg_rd, rd, pass, MO_64);
}
- if (is_scalar) {
- clear_vec_high(s, rd);
- }
-
tcg_temp_free_i64(tcg_rd);
tcg_temp_free_i64(tcg_rn);
+ clear_vec_high(s, !is_scalar, rd);
} else {
TCGv_i32 tcg_rn = tcg_temp_new_i32();
TCGv_i32 tcg_rd = tcg_temp_new_i32();
@@ -8167,13 +8155,9 @@ static void handle_2misc_satacc(DisasContext *s, bool
is_scalar, bool is_u,
}
write_vec_element_i32(s, tcg_rd, rd, pass, MO_32);
}
-
- if (!is_q) {
- clear_vec_high(s, rd);
- }
-
tcg_temp_free_i32(tcg_rd);
tcg_temp_free_i32(tcg_rn);
+ clear_vec_high(s, is_q, rd);
}
}
@@ -8664,9 +8648,7 @@ static void handle_vec_simd_shri(DisasContext *s, bool
is_q, bool is_u,
tcg_temp_free_i64(tcg_round);
done:
- if (!is_q) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, is_q, rd);
}
static void gen_shl8_ins_i64(TCGv_i64 d, TCGv_i64 a, int64_t shift)
@@ -8855,19 +8837,18 @@ static void handle_vec_simd_shrn(DisasContext *s, bool
is_q,
}
if (!is_q) {
- clear_vec_high(s, rd);
write_vec_element(s, tcg_final, rd, 0, MO_64);
} else {
write_vec_element(s, tcg_final, rd, 1, MO_64);
}
-
if (round) {
tcg_temp_free_i64(tcg_round);
}
tcg_temp_free_i64(tcg_rn);
tcg_temp_free_i64(tcg_rd);
tcg_temp_free_i64(tcg_final);
- return;
+
+ clear_vec_high(s, is_q, rd);
}
@@ -9261,9 +9242,7 @@ static void handle_3rd_narrowing(DisasContext *s, int
is_q, int is_u, int size,
write_vec_element_i32(s, tcg_res[pass], rd, pass + part, MO_32);
tcg_temp_free_i32(tcg_res[pass]);
}
- if (!is_q) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, is_q, rd);
}
static void handle_pmull_64(DisasContext *s, int is_q, int rd, int rn, int rm)
@@ -9671,9 +9650,7 @@ static void handle_simd_3same_pair(DisasContext *s, int
is_q, int u, int opcode,
write_vec_element_i32(s, tcg_res[pass], rd, pass, MO_32);
tcg_temp_free_i32(tcg_res[pass]);
}
- if (!is_q) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, is_q, rd);
}
if (fpst) {
@@ -10161,10 +10138,7 @@ static void disas_simd_3same_int(DisasContext *s,
uint32_t insn)
tcg_temp_free_i32(tcg_op2);
}
}
-
- if (!is_q) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, is_q, rd);
}
/* AdvSIMD three same
@@ -10303,9 +10277,7 @@ static void handle_rev(DisasContext *s, int opcode,
bool u,
write_vec_element(s, tcg_tmp, rd, i, grp_size);
tcg_temp_free_i64(tcg_tmp);
}
- if (!is_q) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, is_q, rd);
} else {
int revmask = (1 << grp_size) - 1;
int esize = 8 << size;
@@ -10949,9 +10921,7 @@ static void disas_simd_two_reg_misc(DisasContext *s,
uint32_t insn)
tcg_temp_free_i32(tcg_op);
}
}
- if (!is_q) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, is_q, rd);
if (need_rmode) {
gen_helper_set_rmode(tcg_rmode, tcg_rmode, cpu_env);
@@ -11130,11 +11100,8 @@ static void disas_simd_indexed(DisasContext *s,
uint32_t insn)
tcg_temp_free_i64(tcg_res);
}
- if (is_scalar) {
- clear_vec_high(s, rd);
- }
-
tcg_temp_free_i64(tcg_idx);
+ clear_vec_high(s, !is_scalar, rd);
} else if (!is_long) {
/* 32 bit floating point, or 16 or 32 bit integer.
* For the 16 bit scalar case we use the usual Neon helpers and
@@ -11238,10 +11205,7 @@ static void disas_simd_indexed(DisasContext *s,
uint32_t insn)
}
tcg_temp_free_i32(tcg_idx);
-
- if (!is_q) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, is_q, rd);
} else {
/* long ops: 16x16->32 or 32x32->64 */
TCGv_i64 tcg_res[2];
@@ -11318,9 +11282,7 @@ static void disas_simd_indexed(DisasContext *s,
uint32_t insn)
}
tcg_temp_free_i64(tcg_idx);
- if (is_scalar) {
- clear_vec_high(s, rd);
- }
+ clear_vec_high(s, !is_scalar, rd);
} else {
TCGv_i32 tcg_idx = tcg_temp_new_i32();
--
2.14.3