Moving the following instructions to decodetree specification:
lxv{b16, d2, h8, w4, ds, ws}x : X-form
stxv{b16, d2, h8, w4}x : X-form
The changes were verified by validating that the tcg-ops generated for those
instructions remain the same, which were captured using the '-d in_asm,op' flag.
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
---
target/ppc/insn32.decode | 10 ++
target/ppc/translate/vsx-impl.c.inc | 199 ++++++++++++----------------
target/ppc/translate/vsx-ops.c.inc | 12 --
3 files changed, 97 insertions(+), 124 deletions(-)
diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index 445fdb341f..3d31ef52f8 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -805,9 +805,19 @@ STXSIHX 011111 ..... ..... ..... 1110101101 . @X_TSX
STXSIWX 011111 ..... ..... ..... 0010001100 . @X_TSX
STXSSPX 011111 ..... ..... ..... 1010001100 . @X_TSX
+LXVB16X 011111 ..... ..... ..... 1101101100 . @X_TSX
+LXVD2X 011111 ..... ..... ..... 1101001100 . @X_TSX
+LXVH8X 011111 ..... ..... ..... 1100101100 . @X_TSX
+LXVW4X 011111 ..... ..... ..... 1100001100 . @X_TSX
+LXVDSX 011111 ..... ..... ..... 0101001100 . @X_TSX
+LXVWSX 011111 ..... ..... ..... 0101101100 . @X_TSX
LXVL 011111 ..... ..... ..... 0100001101 . @X_TSX
LXVLL 011111 ..... ..... ..... 0100101101 . @X_TSX
+STXVB16X 011111 ..... ..... ..... 1111101100 . @X_TSX
+STXVD2X 011111 ..... ..... ..... 1111001100 . @X_TSX
+STXVH8X 011111 ..... ..... ..... 1110101100 . @X_TSX
+STXVW4X 011111 ..... ..... ..... 1110001100 . @X_TSX
STXVL 011111 ..... ..... ..... 0110001101 . @X_TSX
STXVLL 011111 ..... ..... ..... 0110101101 . @X_TSX
diff --git a/target/ppc/translate/vsx-impl.c.inc b/target/ppc/translate/vsx-impl.c.inc
index 695b75ded9..739b5ad915 100644
--- a/target/ppc/translate/vsx-impl.c.inc
+++ b/target/ppc/translate/vsx-impl.c.inc
@@ -46,41 +46,37 @@ TRANS_FLAGS2(ISA300, LXSIHZX, do_lxs, gen_qemu_ld16u_i64);
TRANS_FLAGS2(VSX207, LXSIWZX, do_lxs, gen_qemu_ld32u_i64);
TRANS_FLAGS2(VSX207, LXSSPX, do_lxs, gen_qemu_ld32fs);
-static void gen_lxvd2x(DisasContext *ctx)
+static bool trans_LXVD2X(DisasContext *ctx, arg_LXVD2X *a)
{
TCGv EA;
TCGv_i64 t0;
- if (unlikely(!ctx->vsx_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VSXU);
- return;
- }
+
+ REQUIRE_VSX(ctx);
+ REQUIRE_INSNS_FLAGS2(ctx, VSX);
+
t0 = tcg_temp_new_i64();
gen_set_access_type(ctx, ACCESS_INT);
- EA = tcg_temp_new();
- gen_addr_reg_index(ctx, EA);
+ EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
gen_qemu_ld64_i64(ctx, t0, EA);
- set_cpu_vsr(xT(ctx->opcode), t0, true);
+ set_cpu_vsr(a->rt, t0, true);
tcg_gen_addi_tl(EA, EA, 8);
gen_qemu_ld64_i64(ctx, t0, EA);
- set_cpu_vsr(xT(ctx->opcode), t0, false);
+ set_cpu_vsr(a->rt, t0, false);
+ return true;
}
-static void gen_lxvw4x(DisasContext *ctx)
+static bool trans_LXVW4X(DisasContext *ctx, arg_LXVW4X *a)
{
TCGv EA;
- TCGv_i64 xth;
- TCGv_i64 xtl;
- if (unlikely(!ctx->vsx_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VSXU);
- return;
- }
+ TCGv_i64 xth, xtl;
+
+ REQUIRE_VSX(ctx);
+ REQUIRE_INSNS_FLAGS2(ctx, VSX);
+
xth = tcg_temp_new_i64();
xtl = tcg_temp_new_i64();
-
gen_set_access_type(ctx, ACCESS_INT);
- EA = tcg_temp_new();
-
- gen_addr_reg_index(ctx, EA);
+ EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
if (ctx->le_mode) {
TCGv_i64 t0 = tcg_temp_new_i64();
TCGv_i64 t1 = tcg_temp_new_i64();
@@ -97,55 +93,45 @@ static void gen_lxvw4x(DisasContext *ctx)
tcg_gen_addi_tl(EA, EA, 8);
tcg_gen_qemu_ld_i64(xtl, EA, ctx->mem_idx, MO_BEUQ);
}
- set_cpu_vsr(xT(ctx->opcode), xth, true);
- set_cpu_vsr(xT(ctx->opcode), xtl, false);
+ set_cpu_vsr(a->rt, xth, true);
+ set_cpu_vsr(a->rt, xtl, false);
+ return true;
}
-static void gen_lxvwsx(DisasContext *ctx)
+static bool trans_LXVWSX(DisasContext *ctx, arg_LXVWSX *a)
{
TCGv EA;
TCGv_i32 data;
- if (xT(ctx->opcode) < 32) {
- if (unlikely(!ctx->vsx_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VSXU);
- return;
- }
+ if (a->rt < 32) {
+ REQUIRE_VSX(ctx);
} else {
- if (unlikely(!ctx->altivec_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VPU);
- return;
- }
+ REQUIRE_VECTOR(ctx);
}
+ REQUIRE_INSNS_FLAGS2(ctx, ISA300);
gen_set_access_type(ctx, ACCESS_INT);
- EA = tcg_temp_new();
-
- gen_addr_reg_index(ctx, EA);
-
+ EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
data = tcg_temp_new_i32();
tcg_gen_qemu_ld_i32(data, EA, ctx->mem_idx, DEF_MEMOP(MO_UL));
- tcg_gen_gvec_dup_i32(MO_UL, vsr_full_offset(xT(ctx->opcode)), 16, 16, data);
+ tcg_gen_gvec_dup_i32(MO_UL, vsr_full_offset(a->rt), 16, 16, data);
+ return true;
}
-static void gen_lxvdsx(DisasContext *ctx)
+static bool trans_LXVDSX(DisasContext *ctx, arg_LXVDSX *a)
{
TCGv EA;
TCGv_i64 data;
- if (unlikely(!ctx->vsx_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VSXU);
- return;
- }
+ REQUIRE_VSX(ctx);
+ REQUIRE_INSNS_FLAGS2(ctx, VSX);
gen_set_access_type(ctx, ACCESS_INT);
- EA = tcg_temp_new();
-
- gen_addr_reg_index(ctx, EA);
-
+ EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
data = tcg_temp_new_i64();
tcg_gen_qemu_ld_i64(data, EA, ctx->mem_idx, DEF_MEMOP(MO_UQ));
- tcg_gen_gvec_dup_i64(MO_UQ, vsr_full_offset(xT(ctx->opcode)), 16, 16, data);
+ tcg_gen_gvec_dup_i64(MO_UQ, vsr_full_offset(a->rt), 16, 16, data);
+ return true;
}
static void gen_bswap16x8(TCGv_i64 outh, TCGv_i64 outl,
@@ -184,52 +170,47 @@ static void gen_bswap32x4(TCGv_i64 outh, TCGv_i64 outl,
tcg_gen_deposit_i64(outl, outl, lo, 32, 32);
}
-static void gen_lxvh8x(DisasContext *ctx)
+static bool trans_LXVH8X(DisasContext *ctx, arg_LXVH8X *a)
{
TCGv EA;
- TCGv_i64 xth;
- TCGv_i64 xtl;
+ TCGv_i64 xth, xtl;
+
+ REQUIRE_VSX(ctx);
+ REQUIRE_INSNS_FLAGS2(ctx, ISA300);
- if (unlikely(!ctx->vsx_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VSXU);
- return;
- }
xth = tcg_temp_new_i64();
xtl = tcg_temp_new_i64();
gen_set_access_type(ctx, ACCESS_INT);
-
- EA = tcg_temp_new();
- gen_addr_reg_index(ctx, EA);
+ EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
tcg_gen_qemu_ld_i64(xth, EA, ctx->mem_idx, MO_BEUQ);
tcg_gen_addi_tl(EA, EA, 8);
tcg_gen_qemu_ld_i64(xtl, EA, ctx->mem_idx, MO_BEUQ);
if (ctx->le_mode) {
gen_bswap16x8(xth, xtl, xth, xtl);
}
- set_cpu_vsr(xT(ctx->opcode), xth, true);
- set_cpu_vsr(xT(ctx->opcode), xtl, false);
+ set_cpu_vsr(a->rt, xth, true);
+ set_cpu_vsr(a->rt, xtl, false);
+ return true;
}
-static void gen_lxvb16x(DisasContext *ctx)
+static bool trans_LXVB16X(DisasContext *ctx, arg_LXVB16X *a)
{
TCGv EA;
- TCGv_i64 xth;
- TCGv_i64 xtl;
+ TCGv_i64 xth, xtl;
+
+ REQUIRE_VSX(ctx);
+ REQUIRE_INSNS_FLAGS2(ctx, ISA300);
- if (unlikely(!ctx->vsx_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VSXU);
- return;
- }
xth = tcg_temp_new_i64();
xtl = tcg_temp_new_i64();
gen_set_access_type(ctx, ACCESS_INT);
- EA = tcg_temp_new();
- gen_addr_reg_index(ctx, EA);
+ EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
tcg_gen_qemu_ld_i64(xth, EA, ctx->mem_idx, MO_BEUQ);
tcg_gen_addi_tl(EA, EA, 8);
tcg_gen_qemu_ld_i64(xtl, EA, ctx->mem_idx, MO_BEUQ);
- set_cpu_vsr(xT(ctx->opcode), xth, true);
- set_cpu_vsr(xT(ctx->opcode), xtl, false);
+ set_cpu_vsr(a->rt, xth, true);
+ set_cpu_vsr(a->rt, xtl, false);
+ return true;
}
#if defined(TARGET_PPC64)
@@ -329,42 +310,39 @@ TRANS_FLAGS2(ISA300, STXSIHX, do_stxs, gen_qemu_st16_i64);
TRANS_FLAGS2(VSX207, STXSIWX, do_stxs, gen_qemu_st32_i64);
TRANS_FLAGS2(VSX207, STXSSPX, do_stxs, gen_qemu_st32fs);
-static void gen_stxvd2x(DisasContext *ctx)
+static bool trans_STXVD2X(DisasContext *ctx, arg_STXVD2X *a)
{
TCGv EA;
TCGv_i64 t0;
- if (unlikely(!ctx->vsx_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VSXU);
- return;
- }
+
+ REQUIRE_VSX(ctx);
+ REQUIRE_INSNS_FLAGS2(ctx, VSX);
+
t0 = tcg_temp_new_i64();
gen_set_access_type(ctx, ACCESS_INT);
- EA = tcg_temp_new();
- gen_addr_reg_index(ctx, EA);
- get_cpu_vsr(t0, xS(ctx->opcode), true);
+ EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
+ get_cpu_vsr(t0, a->rt, true);
gen_qemu_st64_i64(ctx, t0, EA);
tcg_gen_addi_tl(EA, EA, 8);
- get_cpu_vsr(t0, xS(ctx->opcode), false);
+ get_cpu_vsr(t0, a->rt, false);
gen_qemu_st64_i64(ctx, t0, EA);
+ return true;
}
-static void gen_stxvw4x(DisasContext *ctx)
+static bool trans_STXVW4X(DisasContext *ctx, arg_STXVW4X *a)
{
TCGv EA;
- TCGv_i64 xsh;
- TCGv_i64 xsl;
+ TCGv_i64 xsh, xsl;
+
+ REQUIRE_VSX(ctx);
+ REQUIRE_INSNS_FLAGS2(ctx, VSX);
- if (unlikely(!ctx->vsx_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VSXU);
- return;
- }
xsh = tcg_temp_new_i64();
xsl = tcg_temp_new_i64();
- get_cpu_vsr(xsh, xS(ctx->opcode), true);
- get_cpu_vsr(xsl, xS(ctx->opcode), false);
+ get_cpu_vsr(xsh, a->rt, true);
+ get_cpu_vsr(xsl, a->rt, false);
gen_set_access_type(ctx, ACCESS_INT);
- EA = tcg_temp_new();
- gen_addr_reg_index(ctx, EA);
+ EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
if (ctx->le_mode) {
TCGv_i64 t0 = tcg_temp_new_i64();
TCGv_i64 t1 = tcg_temp_new_i64();
@@ -381,25 +359,23 @@ static void gen_stxvw4x(DisasContext *ctx)
tcg_gen_addi_tl(EA, EA, 8);
tcg_gen_qemu_st_i64(xsl, EA, ctx->mem_idx, MO_BEUQ);
}
+ return true;
}
-static void gen_stxvh8x(DisasContext *ctx)
+static bool trans_STXVH8X(DisasContext *ctx, arg_STXVH8X *a)
{
TCGv EA;
- TCGv_i64 xsh;
- TCGv_i64 xsl;
+ TCGv_i64 xsh, xsl;
+
+ REQUIRE_VSX(ctx);
+ REQUIRE_INSNS_FLAGS2(ctx, ISA300);
- if (unlikely(!ctx->vsx_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VSXU);
- return;
- }
xsh = tcg_temp_new_i64();
xsl = tcg_temp_new_i64();
- get_cpu_vsr(xsh, xS(ctx->opcode), true);
- get_cpu_vsr(xsl, xS(ctx->opcode), false);
+ get_cpu_vsr(xsh, a->rt, true);
+ get_cpu_vsr(xsl, a->rt, false);
gen_set_access_type(ctx, ACCESS_INT);
- EA = tcg_temp_new();
- gen_addr_reg_index(ctx, EA);
+ EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
if (ctx->le_mode) {
TCGv_i64 outh = tcg_temp_new_i64();
TCGv_i64 outl = tcg_temp_new_i64();
@@ -413,28 +389,27 @@ static void gen_stxvh8x(DisasContext *ctx)
tcg_gen_addi_tl(EA, EA, 8);
tcg_gen_qemu_st_i64(xsl, EA, ctx->mem_idx, MO_BEUQ);
}
+ return true;
}
-static void gen_stxvb16x(DisasContext *ctx)
+static bool trans_STXVB16X(DisasContext *ctx, arg_STXVB16X *a)
{
TCGv EA;
- TCGv_i64 xsh;
- TCGv_i64 xsl;
+ TCGv_i64 xsh, xsl;
+
+ REQUIRE_VSX(ctx);
+ REQUIRE_INSNS_FLAGS2(ctx, ISA300);
- if (unlikely(!ctx->vsx_enabled)) {
- gen_exception(ctx, POWERPC_EXCP_VSXU);
- return;
- }
xsh = tcg_temp_new_i64();
xsl = tcg_temp_new_i64();
- get_cpu_vsr(xsh, xS(ctx->opcode), true);
- get_cpu_vsr(xsl, xS(ctx->opcode), false);
+ get_cpu_vsr(xsh, a->rt, true);
+ get_cpu_vsr(xsl, a->rt, false);
gen_set_access_type(ctx, ACCESS_INT);
- EA = tcg_temp_new();
- gen_addr_reg_index(ctx, EA);
+ EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
tcg_gen_qemu_st_i64(xsh, EA, ctx->mem_idx, MO_BEUQ);
tcg_gen_addi_tl(EA, EA, 8);
tcg_gen_qemu_st_i64(xsl, EA, ctx->mem_idx, MO_BEUQ);
+ return true;
}
static void gen_mfvsrwz(DisasContext *ctx)
diff --git a/target/ppc/translate/vsx-ops.c.inc b/target/ppc/translate/vsx-ops.c.inc
index 7f4326c974..91cde088bc 100644
--- a/target/ppc/translate/vsx-ops.c.inc
+++ b/target/ppc/translate/vsx-ops.c.inc
@@ -1,15 +1,3 @@
-GEN_HANDLER_E(lxvd2x, 0x1F, 0x0C, 0x1A, 0, PPC_NONE, PPC2_VSX),
-GEN_HANDLER_E(lxvwsx, 0x1F, 0x0C, 0x0B, 0, PPC_NONE, PPC2_ISA300),
-GEN_HANDLER_E(lxvdsx, 0x1F, 0x0C, 0x0A, 0, PPC_NONE, PPC2_VSX),
-GEN_HANDLER_E(lxvw4x, 0x1F, 0x0C, 0x18, 0, PPC_NONE, PPC2_VSX),
-GEN_HANDLER_E(lxvh8x, 0x1F, 0x0C, 0x19, 0, PPC_NONE, PPC2_ISA300),
-GEN_HANDLER_E(lxvb16x, 0x1F, 0x0C, 0x1B, 0, PPC_NONE, PPC2_ISA300),
-
-GEN_HANDLER_E(stxvd2x, 0x1F, 0xC, 0x1E, 0, PPC_NONE, PPC2_VSX),
-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(mfvsrwz, 0x1F, 0x13, 0x03, 0x0000F800, PPC_NONE, PPC2_VSX207),
GEN_HANDLER_E(mtvsrwa, 0x1F, 0x13, 0x06, 0x0000F800, PPC_NONE, PPC2_VSX207),
GEN_HANDLER_E(mtvsrwz, 0x1F, 0x13, 0x07, 0x0000F800, PPC_NONE, PPC2_VSX207),
--
2.39.3On 6/7/24 07:49, Chinmay Rath wrote:
> Moving the following instructions to decodetree specification:
>
> lxv{b16, d2, h8, w4, ds, ws}x : X-form
> stxv{b16, d2, h8, w4}x : X-form
>
> The changes were verified by validating that the tcg-ops generated for those
> instructions remain the same, which were captured using the '-d in_asm,op' flag.
>
> Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
> ---
> target/ppc/insn32.decode | 10 ++
> target/ppc/translate/vsx-impl.c.inc | 199 ++++++++++++----------------
> target/ppc/translate/vsx-ops.c.inc | 12 --
> 3 files changed, 97 insertions(+), 124 deletions(-)
Because the ops are identical,
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
But you really should update these to use tcg_gen_qemu_ld/st_i128 with the proper
atomicity flags. This will fix an existing bug...
> +static bool trans_LXVD2X(DisasContext *ctx, arg_LXVD2X *a)
> {
> TCGv EA;
> TCGv_i64 t0;
> +
> + REQUIRE_VSX(ctx);
> + REQUIRE_INSNS_FLAGS2(ctx, VSX);
> +
> t0 = tcg_temp_new_i64();
> gen_set_access_type(ctx, ACCESS_INT);
> + EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
> gen_qemu_ld64_i64(ctx, t0, EA);
> + set_cpu_vsr(a->rt, t0, true);
where the vector register is partially modified ...
> tcg_gen_addi_tl(EA, EA, 8);
> gen_qemu_ld64_i64(ctx, t0, EA);
before a fault from the second load is recognized.
Similarly for stores leaving memory partially modified.
r~
Hi Richard,
My apologies for the ill formatted reply in this patch series. Just
realized it now. The cliched 'Tab' issue with the mail client XD.
On 6/7/24 21:16, Richard Henderson wrote:
> On 6/7/24 07:49, Chinmay Rath wrote:
>> Moving the following instructions to decodetree specification:
>>
>> lxv{b16, d2, h8, w4, ds, ws}x : X-form
>> stxv{b16, d2, h8, w4}x : X-form
>>
>> The changes were verified by validating that the tcg-ops generated
>> for those
>> instructions remain the same, which were captured using the '-d
>> in_asm,op' flag.
>>
>> Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
>> ---
>> target/ppc/insn32.decode | 10 ++
>> target/ppc/translate/vsx-impl.c.inc | 199 ++++++++++++----------------
>> target/ppc/translate/vsx-ops.c.inc | 12 --
>> 3 files changed, 97 insertions(+), 124 deletions(-)
>
> Because the ops are identical,
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
>
> But you really should update these to use tcg_gen_qemu_ld/st_i128 with
> the proper atomicity flags. This will fix an existing bug...
^
Surely Richard, I have noted this suggestion from earlier patch and plan
to do this, and a few others which I couldn't implement earlier, along
with some clean-ups this week.
I refrained from doing it with the decodetree movement, to take time to
properly understand and test. Should send out those patches soon.
Thanks & Regards,
Chinmay
>
>> +static bool trans_LXVD2X(DisasContext *ctx, arg_LXVD2X *a)
>> {
>> TCGv EA;
>> TCGv_i64 t0;
>> +
>> + REQUIRE_VSX(ctx);
>> + REQUIRE_INSNS_FLAGS2(ctx, VSX);
>> +
>> t0 = tcg_temp_new_i64();
>> gen_set_access_type(ctx, ACCESS_INT);
>> + EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
>> gen_qemu_ld64_i64(ctx, t0, EA);
>> + set_cpu_vsr(a->rt, t0, true);
>
> where the vector register is partially modified ...
>
>> tcg_gen_addi_tl(EA, EA, 8);
>> gen_qemu_ld64_i64(ctx, t0, EA);
>
> before a fault from the second load is recognized.
> Similarly for stores leaving memory partially modified.
>
>
> r~
>
>
Hi Richard,
On 6/7/24 21:16, Richard Henderson wrote:
> On 6/7/24 07:49, Chinmay Rath wrote:
>> Moving the following instructions to decodetree specification:
>>
>> lxv{b16, d2, h8, w4, ds, ws}x : X-form
>> stxv{b16, d2, h8, w4}x : X-form
>>
>> The changes were verified by validating that the tcg-ops generated
>> for those
>> instructions remain the same, which were captured using the '-d
>> in_asm,op' flag.
>>
>> Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
>> ---
>> target/ppc/insn32.decode | 10 ++
>> target/ppc/translate/vsx-impl.c.inc | 199 ++++++++++++----------------
>> target/ppc/translate/vsx-ops.c.inc | 12 --
>> 3 files changed, 97 insertions(+), 124 deletions(-)
>
> Because the ops are identical,
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
>
> But you really should update these to use tcg_gen_qemu_ld/st_i128 with
> the proper atomicity flags. This will fix an existing bug...
>
^ Surely Richard, I have noted this suggestion of yours from an earlier
patch, and plan to do this change and implement a few of your other
suggestions,
which I couldn't implement earlier, along with some clean-ups this
week.
I refrained from doing it with the decodetree movement, to take
proper time to understand and test.
Should send out those patches soon.
Thanks & Regards,
Chinmay
>> +static bool trans_LXVD2X(DisasContext *ctx, arg_LXVD2X *a)
>> {
>> TCGv EA;
>> TCGv_i64 t0;
>> +
>> + REQUIRE_VSX(ctx);
>> + REQUIRE_INSNS_FLAGS2(ctx, VSX);
>> +
>> t0 = tcg_temp_new_i64();
>> gen_set_access_type(ctx, ACCESS_INT);
>> + EA = do_ea_calc(ctx, a->ra, cpu_gpr[a->rb]);
>> gen_qemu_ld64_i64(ctx, t0, EA);
>> + set_cpu_vsr(a->rt, t0, true);
>
> where the vector register is partially modified ...
>
>> tcg_gen_addi_tl(EA, EA, 8);
>> gen_qemu_ld64_i64(ctx, t0, EA);
>
> before a fault from the second load is recognized.
> Similarly for stores leaving memory partially modified.
>
>
> r~
>
>
© 2016 - 2026 Red Hat, Inc.