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authorMax Filippov <jcmvbkbc@gmail.com>2020-03-14 11:13:53 -0700
committerMax Filippov <jcmvbkbc@gmail.com>2020-08-21 12:48:15 -0700
commitf8c613701637ebfbf75570153715af3ac7aeca9d (patch)
tree2daf1e3b5bd4aa9c65a12b58eb98cdc1b575e3ab /target/xtensa
parentcfa9f0518144c0ea30f51fd2f203a09dd0a40cd9 (diff)
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target/xtensa: implement FPU division and square root
This does not implement all opcodes related to div/sqrt as specified in the xtensa ISA, partly because the official specification is not complete and partly because precise implementation is unnecessarily complex. Instead instructions specific to the div/sqrt sequences are implemented differently, most of them as nops, but the results of div/sqrt sequences is preserved. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'target/xtensa')
-rw-r--r--target/xtensa/fpu_helper.c24
-rw-r--r--target/xtensa/helper.h4
-rw-r--r--target/xtensa/translate.c104
3 files changed, 132 insertions, 0 deletions
diff --git a/target/xtensa/fpu_helper.c b/target/xtensa/fpu_helper.c
index b5faf34..ba3c29d 100644
--- a/target/xtensa/fpu_helper.c
+++ b/target/xtensa/fpu_helper.c
@@ -231,6 +231,30 @@ float32 HELPER(msub_s)(CPUXtensaState *env, float32 a, float32 b, float32 c)
&env->fp_status);
}
+float64 HELPER(mkdadj_d)(CPUXtensaState *env, float64 a, float64 b)
+{
+ set_use_first_nan(true, &env->fp_status);
+ return float64_div(b, a, &env->fp_status);
+}
+
+float32 HELPER(mkdadj_s)(CPUXtensaState *env, float32 a, float32 b)
+{
+ set_use_first_nan(env->config->use_first_nan, &env->fp_status);
+ return float32_div(b, a, &env->fp_status);
+}
+
+float64 HELPER(mksadj_d)(CPUXtensaState *env, float64 v)
+{
+ set_use_first_nan(true, &env->fp_status);
+ return float64_sqrt(v, &env->fp_status);
+}
+
+float32 HELPER(mksadj_s)(CPUXtensaState *env, float32 v)
+{
+ set_use_first_nan(env->config->use_first_nan, &env->fp_status);
+ return float32_sqrt(v, &env->fp_status);
+}
+
uint32_t HELPER(ftoi_d)(CPUXtensaState *env, float64 v,
uint32_t rounding_mode, uint32_t scale)
{
diff --git a/target/xtensa/helper.h b/target/xtensa/helper.h
index 095f754..ae938ce 100644
--- a/target/xtensa/helper.h
+++ b/target/xtensa/helper.h
@@ -83,6 +83,10 @@ DEF_HELPER_4(madd_d, f64, env, f64, f64, f64)
DEF_HELPER_4(madd_s, f32, env, f32, f32, f32)
DEF_HELPER_4(msub_d, f64, env, f64, f64, f64)
DEF_HELPER_4(msub_s, f32, env, f32, f32, f32)
+DEF_HELPER_3(mkdadj_d, f64, env, f64, f64)
+DEF_HELPER_3(mkdadj_s, f32, env, f32, f32)
+DEF_HELPER_2(mksadj_d, f64, env, f64)
+DEF_HELPER_2(mksadj_s, f32, env, f32)
DEF_HELPER_4(ftoi_d, i32, env, f64, i32, i32)
DEF_HELPER_4(ftoui_d, i32, env, f64, i32, i32)
DEF_HELPER_3(itof_d, f64, env, i32, i32)
diff --git a/target/xtensa/translate.c b/target/xtensa/translate.c
index fff29cc..944a157 100644
--- a/target/xtensa/translate.c
+++ b/target/xtensa/translate.c
@@ -7314,6 +7314,38 @@ static void translate_sub_s(DisasContext *dc, const OpcodeArg arg[],
}
}
+static void translate_mkdadj_d(DisasContext *dc, const OpcodeArg arg[],
+ const uint32_t par[])
+{
+ gen_helper_mkdadj_d(arg[0].out, cpu_env, arg[0].in, arg[1].in);
+}
+
+static void translate_mkdadj_s(DisasContext *dc, const OpcodeArg arg[],
+ const uint32_t par[])
+{
+ OpcodeArg arg32[2];
+
+ get_f32_o1_i2(arg, arg32, 0, 0, 1);
+ gen_helper_mkdadj_s(arg32[0].out, cpu_env, arg32[0].in, arg32[1].in);
+ put_f32_o1_i2(arg, arg32, 0, 0, 1);
+}
+
+static void translate_mksadj_d(DisasContext *dc, const OpcodeArg arg[],
+ const uint32_t par[])
+{
+ gen_helper_mksadj_d(arg[0].out, cpu_env, arg[1].in);
+}
+
+static void translate_mksadj_s(DisasContext *dc, const OpcodeArg arg[],
+ const uint32_t par[])
+{
+ OpcodeArg arg32[2];
+
+ get_f32_o1_i1(arg, arg32, 0, 1);
+ gen_helper_mksadj_s(arg32[0].out, cpu_env, arg32[1].in);
+ put_f32_o1_i1(arg, arg32, 0, 1);
+}
+
static void translate_wur_fpu_fcr(DisasContext *dc, const OpcodeArg arg[],
const uint32_t par[])
{
@@ -7350,6 +7382,22 @@ static const XtensaOpcodeOps fpu_ops[] = {
.translate = translate_add_s,
.coprocessor = 0x1,
}, {
+ .name = "addexp.d",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
+ .name = "addexp.s",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
+ .name = "addexpm.d",
+ .translate = translate_mov_s,
+ .coprocessor = 0x1,
+ }, {
+ .name = "addexpm.s",
+ .translate = translate_mov_s,
+ .coprocessor = 0x1,
+ }, {
.name = "ceil.d",
.translate = translate_ftoi_d,
.par = (const uint32_t[]){float_round_up, false},
@@ -7376,6 +7424,22 @@ static const XtensaOpcodeOps fpu_ops[] = {
.translate = translate_cvts_d,
.coprocessor = 0x1,
}, {
+ .name = "div0.d",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
+ .name = "div0.s",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
+ .name = "divn.d",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
+ .name = "divn.s",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
.name = "float.d",
.translate = translate_float_d,
.par = (const uint32_t[]){false},
@@ -7476,6 +7540,30 @@ static const XtensaOpcodeOps fpu_ops[] = {
.translate = translate_madd_s,
.coprocessor = 0x1,
}, {
+ .name = "maddn.d",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
+ .name = "maddn.s",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
+ .name = "mkdadj.d",
+ .translate = translate_mkdadj_d,
+ .coprocessor = 0x1,
+ }, {
+ .name = "mkdadj.s",
+ .translate = translate_mkdadj_s,
+ .coprocessor = 0x1,
+ }, {
+ .name = "mksadj.d",
+ .translate = translate_mksadj_d,
+ .coprocessor = 0x1,
+ }, {
+ .name = "mksadj.s",
+ .translate = translate_mksadj_s,
+ .coprocessor = 0x1,
+ }, {
.name = "mov.d",
.translate = translate_mov_d,
.coprocessor = 0x1,
@@ -7568,6 +7656,14 @@ static const XtensaOpcodeOps fpu_ops[] = {
.translate = translate_neg_s,
.coprocessor = 0x1,
}, {
+ .name = "nexp01.d",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
+ .name = "nexp01.s",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
.name = "oeq.d",
.translate = translate_compare_d,
.par = (const uint32_t[]){COMPARE_OEQ},
@@ -7661,6 +7757,14 @@ static const XtensaOpcodeOps fpu_ops[] = {
.op_flags = XTENSA_OP_STORE,
.coprocessor = 0x1,
}, {
+ .name = "sqrt0.d",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
+ .name = "sqrt0.s",
+ .translate = translate_nop,
+ .coprocessor = 0x1,
+ }, {
.name = "ssi",
.translate = translate_ldsti_s,
.par = (const uint32_t[]){true, true, false},