From: "Philippe Mathieu-Daudé" <philmd@linaro.org>
To: qemu-devel@nongnu.org
Cc: "Philippe Mathieu-Daudé" <philmd@linaro.org>,
"Jiaxun Yang" <jiaxun.yang@flygoat.com>,
"Aurelien Jarno" <aurelien@aurel32.net>,
"Aleksandar Rikalo" <aleksandar.rikalo@syrmia.com>,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
"Richard Henderson" <richard.henderson@linaro.org>
Subject: [PATCH v2 4/7] target/mips: Convert Loongson DIV.G opcodes to decodetree
Date: Thu, 31 Aug 2023 22:30:20 +0200 [thread overview]
Message-ID: <20230831203024.87300-5-philmd@linaro.org> (raw)
In-Reply-To: <20230831203024.87300-1-philmd@linaro.org>
From: Philippe Mathieu-Daudé <f4bug@amsat.org>
DIV.G and DDIV.G are very similar. Provide gen_lext_DIV_G() a
'is_double' argument so it can generate DIV.G (divide 32-bit
signed integers).
With this commit we explicit the template used to generate
opcode for 32/64-bit word variants. Next commits will be less
verbose by providing both variants at once.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
target/mips/tcg/godson2.decode | 1 +
target/mips/tcg/loong-ext.decode | 1 +
target/mips/tcg/loong_translate.c | 28 ++++++++++++++++++++++------
target/mips/tcg/translate.c | 26 --------------------------
4 files changed, 24 insertions(+), 32 deletions(-)
diff --git a/target/mips/tcg/godson2.decode b/target/mips/tcg/godson2.decode
index 382123cc3e..91940c1263 100644
--- a/target/mips/tcg/godson2.decode
+++ b/target/mips/tcg/godson2.decode
@@ -13,4 +13,5 @@
@rs_rt_rd ...... rs:5 rt:5 rd:5 ..... ...... &muldiv
+DIV_G 011111 ..... ..... ..... 00000 011010 @rs_rt_rd
DDIV_G 011111 ..... ..... ..... 00000 011110 @rs_rt_rd
diff --git a/target/mips/tcg/loong-ext.decode b/target/mips/tcg/loong-ext.decode
index 407ca5c78b..e9378abc8e 100644
--- a/target/mips/tcg/loong-ext.decode
+++ b/target/mips/tcg/loong-ext.decode
@@ -14,4 +14,5 @@
@rs_rt_rd ...... rs:5 rt:5 rd:5 ..... ...... &muldiv
+DIV_G 011100 ..... ..... ..... 00000 010100 @rs_rt_rd
DDIV_G 011100 ..... ..... ..... 00000 010101 @rs_rt_rd
diff --git a/target/mips/tcg/loong_translate.c b/target/mips/tcg/loong_translate.c
index bb329ef027..d42cdb7d2e 100644
--- a/target/mips/tcg/loong_translate.c
+++ b/target/mips/tcg/loong_translate.c
@@ -25,15 +25,18 @@
* into general-purpose registers.
*/
-static bool gen_lext_DIV_G(DisasContext *s, int rd, int rs, int rt)
+static bool gen_lext_DIV_G(DisasContext *s, int rd, int rs, int rt,
+ bool is_double)
{
TCGv t0, t1;
TCGLabel *l1, *l2, *l3;
- if (TARGET_LONG_BITS != 64) {
- return false;
+ if (is_double) {
+ if (TARGET_LONG_BITS != 64) {
+ return false;
+ }
+ check_mips_64(s);
}
- check_mips_64(s);
if (rd == 0) {
/* Treat as NOP. */
@@ -49,26 +52,39 @@ static bool gen_lext_DIV_G(DisasContext *s, int rd, int rs, int rt)
gen_load_gpr(t0, rs);
gen_load_gpr(t1, rt);
+ if (!is_double) {
+ tcg_gen_ext32s_tl(t0, t0);
+ tcg_gen_ext32s_tl(t1, t1);
+ }
tcg_gen_brcondi_tl(TCG_COND_NE, t1, 0, l1);
tcg_gen_movi_tl(cpu_gpr[rd], 0);
tcg_gen_br(l3);
gen_set_label(l1);
- tcg_gen_brcondi_tl(TCG_COND_NE, t0, -1LL << 63, l2);
+ tcg_gen_brcondi_tl(TCG_COND_NE, t0, is_double && TARGET_LONG_BITS == 64
+ ? LLONG_MIN : INT_MIN, l2);
tcg_gen_brcondi_tl(TCG_COND_NE, t1, -1LL, l2);
tcg_gen_mov_tl(cpu_gpr[rd], t0);
tcg_gen_br(l3);
gen_set_label(l2);
tcg_gen_div_tl(cpu_gpr[rd], t0, t1);
+ if (!is_double) {
+ tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
+ }
gen_set_label(l3);
return true;
}
+static bool trans_DIV_G(DisasContext *s, arg_muldiv *a)
+{
+ return gen_lext_DIV_G(s, a->rt, a->rs, a->rd, false);
+}
+
static bool trans_DDIV_G(DisasContext *s, arg_muldiv *a)
{
- return gen_lext_DIV_G(s, a->rt, a->rs, a->rd);
+ return gen_lext_DIV_G(s, a->rt, a->rs, a->rd, true);
}
bool decode_ext_loongson(DisasContext *ctx, uint32_t insn)
diff --git a/target/mips/tcg/translate.c b/target/mips/tcg/translate.c
index 42be1689c2..59853f1d87 100644
--- a/target/mips/tcg/translate.c
+++ b/target/mips/tcg/translate.c
@@ -333,7 +333,6 @@ enum {
OPC_DMULT_G_2F = 0x11 | OPC_SPECIAL2,
OPC_MULTU_G_2F = 0x12 | OPC_SPECIAL2,
OPC_DMULTU_G_2F = 0x13 | OPC_SPECIAL2,
- OPC_DIV_G_2F = 0x14 | OPC_SPECIAL2,
OPC_DIVU_G_2F = 0x16 | OPC_SPECIAL2,
OPC_DDIVU_G_2F = 0x17 | OPC_SPECIAL2,
OPC_MOD_G_2F = 0x1c | OPC_SPECIAL2,
@@ -371,7 +370,6 @@ enum {
/* Loongson 2E */
OPC_MULT_G_2E = 0x18 | OPC_SPECIAL3,
OPC_MULTU_G_2E = 0x19 | OPC_SPECIAL3,
- OPC_DIV_G_2E = 0x1A | OPC_SPECIAL3,
OPC_DIVU_G_2E = 0x1B | OPC_SPECIAL3,
OPC_DMULT_G_2E = 0x1C | OPC_SPECIAL3,
OPC_DMULTU_G_2E = 0x1D | OPC_SPECIAL3,
@@ -3623,28 +3621,6 @@ static void gen_loongson_integer(DisasContext *ctx, uint32_t opc,
tcg_gen_mul_tl(cpu_gpr[rd], t0, t1);
tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
break;
- case OPC_DIV_G_2E:
- case OPC_DIV_G_2F:
- {
- TCGLabel *l1 = gen_new_label();
- TCGLabel *l2 = gen_new_label();
- TCGLabel *l3 = gen_new_label();
- tcg_gen_ext32s_tl(t0, t0);
- tcg_gen_ext32s_tl(t1, t1);
- tcg_gen_brcondi_tl(TCG_COND_NE, t1, 0, l1);
- tcg_gen_movi_tl(cpu_gpr[rd], 0);
- tcg_gen_br(l3);
- gen_set_label(l1);
- tcg_gen_brcondi_tl(TCG_COND_NE, t0, INT_MIN, l2);
- tcg_gen_brcondi_tl(TCG_COND_NE, t1, -1, l2);
- tcg_gen_mov_tl(cpu_gpr[rd], t0);
- tcg_gen_br(l3);
- gen_set_label(l2);
- tcg_gen_div_tl(cpu_gpr[rd], t0, t1);
- tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
- gen_set_label(l3);
- }
- break;
case OPC_DIVU_G_2E:
case OPC_DIVU_G_2F:
{
@@ -13674,7 +13650,6 @@ static void decode_opc_special2_legacy(CPUMIPSState *env, DisasContext *ctx)
case OPC_MUL:
gen_arith(ctx, op1, rd, rs, rt);
break;
- case OPC_DIV_G_2F:
case OPC_DIVU_G_2F:
case OPC_MULT_G_2F:
case OPC_MULTU_G_2F:
@@ -13847,7 +13822,6 @@ static void decode_opc_special3_legacy(CPUMIPSState *env, DisasContext *ctx)
op1 = MASK_SPECIAL3(ctx->opcode);
switch (op1) {
- case OPC_DIV_G_2E:
case OPC_DIVU_G_2E:
case OPC_MOD_G_2E:
case OPC_MODU_G_2E:
--
2.41.0
next prev parent reply other threads:[~2023-08-31 20:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-31 20:30 [PATCH v2 0/7] target/mips: Convert Loongson LEXT opcodes to decodetree Philippe Mathieu-Daudé
2023-08-31 20:30 ` [PATCH v2 1/7] target/mips: Simplify Loongson MULTU.G opcode Philippe Mathieu-Daudé
2023-08-31 23:53 ` Richard Henderson
2023-08-31 20:30 ` [PATCH v2 2/7] target/mips: Re-introduce OPC_ADDUH_QB_DSP and OPC_MUL_PH_DSP Philippe Mathieu-Daudé
2023-08-31 20:30 ` [PATCH v2 3/7] target/mips: Convert Loongson DDIV.G opcodes to decodetree Philippe Mathieu-Daudé
2023-08-31 20:30 ` Philippe Mathieu-Daudé [this message]
2023-08-31 20:30 ` [PATCH v2 5/7] target/mips: Convert Loongson [D]DIVU.G " Philippe Mathieu-Daudé
2023-08-31 20:30 ` [PATCH v2 6/7] target/mips: Convert Loongson [D]MOD[U].G " Philippe Mathieu-Daudé
2023-08-31 20:30 ` [PATCH v2 7/7] target/mips: Convert Loongson [D]MULT[U].G " Philippe Mathieu-Daudé
2023-09-01 0:29 ` Richard Henderson
2024-10-26 15:30 ` Philippe Mathieu-Daudé
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