* [Qemu-devel] [PATCH 0/2] tcg: Add tcg_gen_mulsu2_*
@ 2016-09-27 21:23 Richard Henderson
2016-09-27 21:23 ` [Qemu-devel] [PATCH 1/2] tcg: Add tcg_gen_mulsu2_{i32,i64,tl} Richard Henderson
2016-09-27 21:23 ` [Qemu-devel] [PATCH 2/2] target-microblaze: Cleanup dec_mul Richard Henderson
0 siblings, 2 replies; 4+ messages in thread
From: Richard Henderson @ 2016-09-27 21:23 UTC (permalink / raw)
To: qemu-devel; +Cc: Sagar Karandikar
While reviewing the recent riscv patch set, I made a suggestion to copy
some of the bits from tcg_gen_muls2_i64 in order to implement the mulhsu
instruction.
However, I noticed that the same operation is present in another target,
so I thought that it would be better to have this as a standard operation.
r~
Richard Henderson (2):
tcg: Add tcg_gen_mulsu2_{i32,i64,tl}
target-microblaze: Cleanup dec_mul
target-microblaze/translate.c | 61 +++++++------------------------------------
tcg/tcg-op.c | 43 ++++++++++++++++++++++++++++++
tcg/tcg-op.h | 4 +++
3 files changed, 56 insertions(+), 52 deletions(-)
--
2.5.5
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Qemu-devel] [PATCH 1/2] tcg: Add tcg_gen_mulsu2_{i32,i64,tl}
2016-09-27 21:23 [Qemu-devel] [PATCH 0/2] tcg: Add tcg_gen_mulsu2_* Richard Henderson
@ 2016-09-27 21:23 ` Richard Henderson
2016-09-27 21:23 ` [Qemu-devel] [PATCH 2/2] target-microblaze: Cleanup dec_mul Richard Henderson
1 sibling, 0 replies; 4+ messages in thread
From: Richard Henderson @ 2016-09-27 21:23 UTC (permalink / raw)
To: qemu-devel; +Cc: Sagar Karandikar
This multiply has one signed input and one unsigned input,
producing the full double-width result.
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
tcg/tcg-op.c | 43 +++++++++++++++++++++++++++++++++++++++++++
tcg/tcg-op.h | 4 ++++
2 files changed, 47 insertions(+)
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index 291d50b..d92a6cd 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -688,6 +688,33 @@ void tcg_gen_muls2_i32(TCGv_i32 rl, TCGv_i32 rh, TCGv_i32 arg1, TCGv_i32 arg2)
}
}
+void tcg_gen_mulsu2_i32(TCGv_i32 rl, TCGv_i32 rh, TCGv_i32 arg1, TCGv_i32 arg2)
+{
+ if (TCG_TARGET_REG_BITS == 32) {
+ TCGv_i32 t0 = tcg_temp_new_i32();
+ TCGv_i32 t1 = tcg_temp_new_i32();
+ TCGv_i32 t2 = tcg_temp_new_i32();
+ tcg_gen_mulu2_i32(t0, t1, arg1, arg2);
+ /* Adjust for negative input for the signed arg1. */
+ tcg_gen_sari_i32(t2, arg1, 31);
+ tcg_gen_and_i32(t2, t2, arg2);
+ tcg_gen_sub_i32(rh, t1, t2);
+ tcg_gen_mov_i32(rl, t0);
+ tcg_temp_free_i32(t0);
+ tcg_temp_free_i32(t1);
+ tcg_temp_free_i32(t2);
+ } else {
+ TCGv_i64 t0 = tcg_temp_new_i64();
+ TCGv_i64 t1 = tcg_temp_new_i64();
+ tcg_gen_ext_i32_i64(t0, arg1);
+ tcg_gen_extu_i32_i64(t1, arg2);
+ tcg_gen_mul_i64(t0, t0, t1);
+ tcg_gen_extr_i64_i32(rl, rh, t0);
+ tcg_temp_free_i64(t0);
+ tcg_temp_free_i64(t1);
+ }
+}
+
void tcg_gen_ext8s_i32(TCGv_i32 ret, TCGv_i32 arg)
{
if (TCG_TARGET_HAS_ext8s_i32) {
@@ -1758,6 +1785,22 @@ void tcg_gen_muls2_i64(TCGv_i64 rl, TCGv_i64 rh, TCGv_i64 arg1, TCGv_i64 arg2)
}
}
+void tcg_gen_mulsu2_i64(TCGv_i64 rl, TCGv_i64 rh, TCGv_i64 arg1, TCGv_i64 arg2)
+{
+ TCGv_i64 t0 = tcg_temp_new_i64();
+ TCGv_i64 t1 = tcg_temp_new_i64();
+ TCGv_i64 t2 = tcg_temp_new_i64();
+ tcg_gen_mulu2_i64(t0, t1, arg1, arg2);
+ /* Adjust for negative input for the signed arg1. */
+ tcg_gen_sari_i64(t2, arg1, 63);
+ tcg_gen_and_i64(t2, t2, arg2);
+ tcg_gen_sub_i64(rh, t1, t2);
+ tcg_gen_mov_i64(rl, t0);
+ tcg_temp_free_i64(t0);
+ tcg_temp_free_i64(t1);
+ tcg_temp_free_i64(t2);
+}
+
/* Size changing operations. */
void tcg_gen_extrl_i64_i32(TCGv_i32 ret, TCGv_i64 arg)
diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h
index 02cb376..56407d2 100644
--- a/tcg/tcg-op.h
+++ b/tcg/tcg-op.h
@@ -306,6 +306,7 @@ void tcg_gen_sub2_i32(TCGv_i32 rl, TCGv_i32 rh, TCGv_i32 al,
TCGv_i32 ah, TCGv_i32 bl, TCGv_i32 bh);
void tcg_gen_mulu2_i32(TCGv_i32 rl, TCGv_i32 rh, TCGv_i32 arg1, TCGv_i32 arg2);
void tcg_gen_muls2_i32(TCGv_i32 rl, TCGv_i32 rh, TCGv_i32 arg1, TCGv_i32 arg2);
+void tcg_gen_mulsu2_i32(TCGv_i32 rl, TCGv_i32 rh, TCGv_i32 arg1, TCGv_i32 arg2);
void tcg_gen_ext8s_i32(TCGv_i32 ret, TCGv_i32 arg);
void tcg_gen_ext16s_i32(TCGv_i32 ret, TCGv_i32 arg);
void tcg_gen_ext8u_i32(TCGv_i32 ret, TCGv_i32 arg);
@@ -482,6 +483,7 @@ void tcg_gen_sub2_i64(TCGv_i64 rl, TCGv_i64 rh, TCGv_i64 al,
TCGv_i64 ah, TCGv_i64 bl, TCGv_i64 bh);
void tcg_gen_mulu2_i64(TCGv_i64 rl, TCGv_i64 rh, TCGv_i64 arg1, TCGv_i64 arg2);
void tcg_gen_muls2_i64(TCGv_i64 rl, TCGv_i64 rh, TCGv_i64 arg1, TCGv_i64 arg2);
+void tcg_gen_mulsu2_i64(TCGv_i64 rl, TCGv_i64 rh, TCGv_i64 arg1, TCGv_i64 arg2);
void tcg_gen_not_i64(TCGv_i64 ret, TCGv_i64 arg);
void tcg_gen_ext8s_i64(TCGv_i64 ret, TCGv_i64 arg);
void tcg_gen_ext16s_i64(TCGv_i64 ret, TCGv_i64 arg);
@@ -932,6 +934,7 @@ static inline void tcg_gen_qemu_st64(TCGv_i64 arg, TCGv addr, int mem_index)
#define tcg_gen_sub2_tl tcg_gen_sub2_i64
#define tcg_gen_mulu2_tl tcg_gen_mulu2_i64
#define tcg_gen_muls2_tl tcg_gen_muls2_i64
+#define tcg_gen_mulsu2_tl tcg_gen_mulsu2_i64
#else
#define tcg_gen_movi_tl tcg_gen_movi_i32
#define tcg_gen_mov_tl tcg_gen_mov_i32
@@ -1009,6 +1012,7 @@ static inline void tcg_gen_qemu_st64(TCGv_i64 arg, TCGv addr, int mem_index)
#define tcg_gen_sub2_tl tcg_gen_sub2_i32
#define tcg_gen_mulu2_tl tcg_gen_mulu2_i32
#define tcg_gen_muls2_tl tcg_gen_muls2_i32
+#define tcg_gen_mulsu2_tl tcg_gen_mulsu2_i32
#endif
#if UINTPTR_MAX == UINT32_MAX
--
2.5.5
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [Qemu-devel] [PATCH 2/2] target-microblaze: Cleanup dec_mul
2016-09-27 21:23 [Qemu-devel] [PATCH 0/2] tcg: Add tcg_gen_mulsu2_* Richard Henderson
2016-09-27 21:23 ` [Qemu-devel] [PATCH 1/2] tcg: Add tcg_gen_mulsu2_{i32,i64,tl} Richard Henderson
@ 2016-09-27 21:23 ` Richard Henderson
2016-09-28 7:36 ` Edgar E. Iglesias
1 sibling, 1 reply; 4+ messages in thread
From: Richard Henderson @ 2016-09-27 21:23 UTC (permalink / raw)
To: qemu-devel; +Cc: Sagar Karandikar, Edgar E. Iglesias
Use tcg_gen_mul_tl for muli and mul instructions.
Use tcg_gen_muls2_tl for mulh instruction.
Use tcg_gen_mulu2_tl for mulhu instruction.
Use tcg_gen_mulsu2_tl for mulhsu instruction.
Note that this last fixes a bug, in that mulhsu was
previously treating both operands as signed, instead
of treating rb as unsigned.
Cc: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
target-microblaze/translate.c | 61 +++++++------------------------------------
1 file changed, 9 insertions(+), 52 deletions(-)
diff --git a/target-microblaze/translate.c b/target-microblaze/translate.c
index 5274191..de2090a 100644
--- a/target-microblaze/translate.c
+++ b/target-microblaze/translate.c
@@ -581,50 +581,10 @@ static void dec_msr(DisasContext *dc)
}
}
-/* 64-bit signed mul, lower result in d and upper in d2. */
-static void t_gen_muls(TCGv d, TCGv d2, TCGv a, TCGv b)
-{
- TCGv_i64 t0, t1;
-
- t0 = tcg_temp_new_i64();
- t1 = tcg_temp_new_i64();
-
- tcg_gen_ext_i32_i64(t0, a);
- tcg_gen_ext_i32_i64(t1, b);
- tcg_gen_mul_i64(t0, t0, t1);
-
- tcg_gen_extrl_i64_i32(d, t0);
- tcg_gen_shri_i64(t0, t0, 32);
- tcg_gen_extrl_i64_i32(d2, t0);
-
- tcg_temp_free_i64(t0);
- tcg_temp_free_i64(t1);
-}
-
-/* 64-bit unsigned muls, lower result in d and upper in d2. */
-static void t_gen_mulu(TCGv d, TCGv d2, TCGv a, TCGv b)
-{
- TCGv_i64 t0, t1;
-
- t0 = tcg_temp_new_i64();
- t1 = tcg_temp_new_i64();
-
- tcg_gen_extu_i32_i64(t0, a);
- tcg_gen_extu_i32_i64(t1, b);
- tcg_gen_mul_i64(t0, t0, t1);
-
- tcg_gen_extrl_i64_i32(d, t0);
- tcg_gen_shri_i64(t0, t0, 32);
- tcg_gen_extrl_i64_i32(d2, t0);
-
- tcg_temp_free_i64(t0);
- tcg_temp_free_i64(t1);
-}
-
/* Multiplier unit. */
static void dec_mul(DisasContext *dc)
{
- TCGv d[2];
+ TCGv tmp;
unsigned int subcode;
if ((dc->tb_flags & MSR_EE_FLAG)
@@ -636,13 +596,11 @@ static void dec_mul(DisasContext *dc)
}
subcode = dc->imm & 3;
- d[0] = tcg_temp_new();
- d[1] = tcg_temp_new();
if (dc->type_b) {
LOG_DIS("muli r%d r%d %x\n", dc->rd, dc->ra, dc->imm);
- t_gen_mulu(cpu_R[dc->rd], d[1], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
- goto done;
+ tcg_gen_mul_tl(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
+ return;
}
/* mulh, mulhsu and mulhu are not available if C_USE_HW_MUL is < 2. */
@@ -651,30 +609,29 @@ static void dec_mul(DisasContext *dc)
/* nop??? */
}
+ tmp = tcg_temp_new();
switch (subcode) {
case 0:
LOG_DIS("mul r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
- t_gen_mulu(cpu_R[dc->rd], d[1], cpu_R[dc->ra], cpu_R[dc->rb]);
+ tcg_gen_mul_tl(cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
break;
case 1:
LOG_DIS("mulh r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
- t_gen_muls(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
+ tcg_gen_muls2_tl(tmp, cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
break;
case 2:
LOG_DIS("mulhsu r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
- t_gen_muls(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
+ tcg_gen_mulsu2_tl(tmp, cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
break;
case 3:
LOG_DIS("mulhu r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
- t_gen_mulu(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
+ tcg_gen_mulu2_tl(tmp, cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
break;
default:
cpu_abort(CPU(dc->cpu), "unknown MUL insn %x\n", subcode);
break;
}
-done:
- tcg_temp_free(d[0]);
- tcg_temp_free(d[1]);
+ tcg_temp_free(tmp);
}
/* Div unit. */
--
2.5.5
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] [PATCH 2/2] target-microblaze: Cleanup dec_mul
2016-09-27 21:23 ` [Qemu-devel] [PATCH 2/2] target-microblaze: Cleanup dec_mul Richard Henderson
@ 2016-09-28 7:36 ` Edgar E. Iglesias
0 siblings, 0 replies; 4+ messages in thread
From: Edgar E. Iglesias @ 2016-09-28 7:36 UTC (permalink / raw)
To: Richard Henderson; +Cc: qemu-devel, Sagar Karandikar
On Tue, Sep 27, 2016 at 02:23:53PM -0700, Richard Henderson wrote:
> Use tcg_gen_mul_tl for muli and mul instructions.
> Use tcg_gen_muls2_tl for mulh instruction.
> Use tcg_gen_mulu2_tl for mulhu instruction.
> Use tcg_gen_mulsu2_tl for mulhsu instruction.
>
> Note that this last fixes a bug, in that mulhsu was
> previously treating both operands as signed, instead
> of treating rb as unsigned.
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
>
> Cc: Edgar E. Iglesias <edgar.iglesias@gmail.com>
> Signed-off-by: Richard Henderson <rth@twiddle.net>
> ---
> target-microblaze/translate.c | 61 +++++++------------------------------------
> 1 file changed, 9 insertions(+), 52 deletions(-)
>
> diff --git a/target-microblaze/translate.c b/target-microblaze/translate.c
> index 5274191..de2090a 100644
> --- a/target-microblaze/translate.c
> +++ b/target-microblaze/translate.c
> @@ -581,50 +581,10 @@ static void dec_msr(DisasContext *dc)
> }
> }
>
> -/* 64-bit signed mul, lower result in d and upper in d2. */
> -static void t_gen_muls(TCGv d, TCGv d2, TCGv a, TCGv b)
> -{
> - TCGv_i64 t0, t1;
> -
> - t0 = tcg_temp_new_i64();
> - t1 = tcg_temp_new_i64();
> -
> - tcg_gen_ext_i32_i64(t0, a);
> - tcg_gen_ext_i32_i64(t1, b);
> - tcg_gen_mul_i64(t0, t0, t1);
> -
> - tcg_gen_extrl_i64_i32(d, t0);
> - tcg_gen_shri_i64(t0, t0, 32);
> - tcg_gen_extrl_i64_i32(d2, t0);
> -
> - tcg_temp_free_i64(t0);
> - tcg_temp_free_i64(t1);
> -}
> -
> -/* 64-bit unsigned muls, lower result in d and upper in d2. */
> -static void t_gen_mulu(TCGv d, TCGv d2, TCGv a, TCGv b)
> -{
> - TCGv_i64 t0, t1;
> -
> - t0 = tcg_temp_new_i64();
> - t1 = tcg_temp_new_i64();
> -
> - tcg_gen_extu_i32_i64(t0, a);
> - tcg_gen_extu_i32_i64(t1, b);
> - tcg_gen_mul_i64(t0, t0, t1);
> -
> - tcg_gen_extrl_i64_i32(d, t0);
> - tcg_gen_shri_i64(t0, t0, 32);
> - tcg_gen_extrl_i64_i32(d2, t0);
> -
> - tcg_temp_free_i64(t0);
> - tcg_temp_free_i64(t1);
> -}
> -
> /* Multiplier unit. */
> static void dec_mul(DisasContext *dc)
> {
> - TCGv d[2];
> + TCGv tmp;
> unsigned int subcode;
>
> if ((dc->tb_flags & MSR_EE_FLAG)
> @@ -636,13 +596,11 @@ static void dec_mul(DisasContext *dc)
> }
>
> subcode = dc->imm & 3;
> - d[0] = tcg_temp_new();
> - d[1] = tcg_temp_new();
>
> if (dc->type_b) {
> LOG_DIS("muli r%d r%d %x\n", dc->rd, dc->ra, dc->imm);
> - t_gen_mulu(cpu_R[dc->rd], d[1], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
> - goto done;
> + tcg_gen_mul_tl(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc)));
> + return;
> }
>
> /* mulh, mulhsu and mulhu are not available if C_USE_HW_MUL is < 2. */
> @@ -651,30 +609,29 @@ static void dec_mul(DisasContext *dc)
> /* nop??? */
> }
>
> + tmp = tcg_temp_new();
> switch (subcode) {
> case 0:
> LOG_DIS("mul r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
> - t_gen_mulu(cpu_R[dc->rd], d[1], cpu_R[dc->ra], cpu_R[dc->rb]);
> + tcg_gen_mul_tl(cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
> break;
> case 1:
> LOG_DIS("mulh r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
> - t_gen_muls(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
> + tcg_gen_muls2_tl(tmp, cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
> break;
> case 2:
> LOG_DIS("mulhsu r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
> - t_gen_muls(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
> + tcg_gen_mulsu2_tl(tmp, cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
> break;
> case 3:
> LOG_DIS("mulhu r%d r%d r%d\n", dc->rd, dc->ra, dc->rb);
> - t_gen_mulu(d[0], cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
> + tcg_gen_mulu2_tl(tmp, cpu_R[dc->rd], cpu_R[dc->ra], cpu_R[dc->rb]);
> break;
> default:
> cpu_abort(CPU(dc->cpu), "unknown MUL insn %x\n", subcode);
> break;
> }
> -done:
> - tcg_temp_free(d[0]);
> - tcg_temp_free(d[1]);
> + tcg_temp_free(tmp);
> }
>
> /* Div unit. */
> --
> 2.5.5
>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-09-28 7:36 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-09-27 21:23 [Qemu-devel] [PATCH 0/2] tcg: Add tcg_gen_mulsu2_* Richard Henderson
2016-09-27 21:23 ` [Qemu-devel] [PATCH 1/2] tcg: Add tcg_gen_mulsu2_{i32,i64,tl} Richard Henderson
2016-09-27 21:23 ` [Qemu-devel] [PATCH 2/2] target-microblaze: Cleanup dec_mul Richard Henderson
2016-09-28 7:36 ` Edgar E. Iglesias
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