[05/13] target-ppc: implement stxvl instruction

Commit Message

Nikunj A. Dadhania Dec. 5, 2016, 11:25 a.m. UTC

stxvl: Store VSX Vector with Length

Vector (8-bit elements) in BE:
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+--+--+
|“T”|“h”|“i”|“s”|“ ”|“i”|“s”|“ ”|“a”|“ ”|“T”|“E”|“S”|“T”|00|00|
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+--+--+

Vector (8-bit elements) in LE:
+--+--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
|00|00|“T”|“S”|“E”|“T”|“ ”|“a”|“ ”|“s”|“i”|“ ”|“s”|“i”|"h"|"T"|
+--+--+---+---+---+---+---+---+---+---+---+---+---+---+---+---+

Storing 14 bytes would result in following Little/Big-endian Storage:
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+--+--+
|“T”|“h”|“i”|“s”|“ ”|“i”|“s”|“ ”|“a”|“ ”|“T”|“E”|“S”|“T”|FF|FF|
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+--+--+

Signed-off-by: Nikunj A Dadhania <[e-mail]>
---
 target-ppc/helper.h                 |  1 +
 target-ppc/mem_helper.c             | 17 +++++++++++++++++
 target-ppc/translate/vsx-impl.inc.c |  1 +
 target-ppc/translate/vsx-ops.inc.c  |  1 +
 4 files changed, 20 insertions(+)

Comments

Richard Henderson Dec. 5, 2016, 5:55 p.m. UTC | #1

On 12/05/2016 03:25 AM, Nikunj A Dadhania wrote:
> +    for (i = 15; i > 15 - end; i--) {
> +        cpu_stb_data_ra(env, addr, xt.u8[i], GETPC());
> +        addr = addr_add(env, addr, 1);
> +    }

(1) you need to handle nb > 16.
(2) don't you need different byte indexing for little-endian?


r~

Nikunj A. Dadhania Dec. 6, 2016, 5:46 a.m. UTC | #2

Richard Henderson <[e-mail]> writes:

> On 12/05/2016 03:25 AM, Nikunj A Dadhania wrote:
>> +    for (i = 15; i > 15 - end; i--) {
>> +        cpu_stb_data_ra(env, addr, xt.u8[i], GETPC());
>> +        addr = addr_add(env, addr, 1);
>> +    }
>
> (1) you need to handle nb > 16.

Sure will handle that.

> (2) don't you need different byte indexing for little-endian?

AFAIU, no, I am going by the example of the ISA.

Regards
Nikunj

Patch

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 67c8b71..5ddc96d 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -319,6 +319,7 @@  DEF_HELPER_3(stvehx, void, env, avr, tl)
 DEF_HELPER_3(stvewx, void, env, avr, tl)
 DEF_HELPER_4(lxvl, void, env, tl, tl, tl)
 DEF_HELPER_4(lxvll, void, env, tl, tl, tl)
+DEF_HELPER_4(stxvl, void, env, tl, tl, tl)
 DEF_HELPER_4(vsumsws, void, env, avr, avr, avr)
 DEF_HELPER_4(vsum2sws, void, env, avr, avr, avr)
 DEF_HELPER_4(vsum4sbs, void, env, avr, avr, avr)
diff --git a/target-ppc/mem_helper.c b/target-ppc/mem_helper.c
index c5826bc..6227c4d 100644
--- a/target-ppc/mem_helper.c
+++ b/target-ppc/mem_helper.c
@@ -334,6 +334,23 @@  void helper_lxvll(CPUPPCState *env, target_ulong addr,
     putVSR(xt_num, &xt, env);
 }
 
+void helper_stxvl(CPUPPCState *env, target_ulong addr,
+                 target_ulong xt_num, target_ulong rb)
+{
+    int i;
+    ppc_vsr_t xt;
+    target_ulong end = rb & 0xFF;
+
+    if (!end) {
+        return;
+    }
+    getVSR(xt_num, &xt, env);
+    for (i = 15; i > 15 - end; i--) {
+        cpu_stb_data_ra(env, addr, xt.u8[i], GETPC());
+        addr = addr_add(env, addr, 1);
+    }
+}
+
 #undef HI_IDX
 #undef LO_IDX
 
diff --git a/target-ppc/translate/vsx-impl.inc.c b/target-ppc/translate/vsx-impl.inc.c
index 40f584e..d8e2ab4 100644
--- a/target-ppc/translate/vsx-impl.inc.c
+++ b/target-ppc/translate/vsx-impl.inc.c
@@ -267,6 +267,7 @@  static void gen_##name(DisasContext *ctx)                       \
 
 VSX_VECTOR_LOAD_STORE_LENGTH(lxvl)
 VSX_VECTOR_LOAD_STORE_LENGTH(lxvll)
+VSX_VECTOR_LOAD_STORE_LENGTH(stxvl)
 
 #define VSX_LOAD_SCALAR_DS(name, operation)                       \
 static void gen_##name(DisasContext *ctx)                         \
diff --git a/target-ppc/translate/vsx-ops.inc.c b/target-ppc/translate/vsx-ops.inc.c
index 7751a7b..1a980d6 100644
--- a/target-ppc/translate/vsx-ops.inc.c
+++ b/target-ppc/translate/vsx-ops.inc.c
@@ -23,6 +23,7 @@  GEN_HANDLER_E(stxvw4x, 0x1F, 0xC, 0x1C, 0, PPC_NONE, PPC2_VSX),
 GEN_HANDLER_E(stxvh8x, 0x1F, 0x0C, 0x1D, 0, PPC_NONE,  PPC2_ISA300),
 GEN_HANDLER_E(stxvb16x, 0x1F, 0x0C, 0x1F, 0, PPC_NONE, PPC2_ISA300),
 GEN_HANDLER_E(stxvx, 0x1F, 0x0C, 0x0C, 0, PPC_NONE, PPC2_ISA300),
+GEN_HANDLER_E(stxvl, 0x1F, 0x0D, 0x0C, 0, PPC_NONE, PPC2_ISA300),
 
 GEN_HANDLER_E(mfvsrwz, 0x1F, 0x13, 0x03, 0x0000F800, PPC_NONE, PPC2_VSX207),
 GEN_HANDLER_E(mtvsrwa, 0x1F, 0x13, 0x06, 0x0000F800, PPC_NONE, PPC2_VSX207),