[2/4] target-ppc: implement vnegw/d instructions

Commit Message

Nikunj A. Dadhania Oct. 7, 2016, 6:57 p.m. UTC

Vector Integer Negate Instructions:

vnegw: Vector Negate Word
vnegd: Vector Negate Doubleword

Signed-off-by: Nikunj A Dadhania <[e-mail]>
---
 target-ppc/helper.h                 |  2 ++
 target-ppc/int_helper.c             | 12 ++++++++++++
 target-ppc/translate/vmx-impl.inc.c |  2 ++
 target-ppc/translate/vmx-ops.inc.c  |  2 ++
 4 files changed, 18 insertions(+)

Comments

Richard Henderson Oct. 9, 2016, 11:09 p.m. UTC | #1

On 10/07/2016 01:57 PM, Nikunj A Dadhania wrote:
> +        r->element[i] = (~(b->element[i]) + 1) & mask;              \

Any reason you're not writing this as a proper negate?


r~

Nikunj A. Dadhania Oct. 10, 2016, 5:12 a.m. UTC | #2

Richard Henderson <[e-mail]> writes:

> On 10/07/2016 01:57 PM, Nikunj A Dadhania wrote:
>> +        r->element[i] = (~(b->element[i]) + 1) & mask;              \
>
> Any reason you're not writing this as a proper negate?

No particular reason, I was just trying to mimic the pseudo code in the
ISA.

r->element[i] = -b->element[i];

Should be fine as well. 

Regards,
Nikunj

Patch

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 04c6421..5fcc546 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -272,6 +272,8 @@  DEF_HELPER_2(vextsh2w, void, avr, avr)
 DEF_HELPER_2(vextsb2d, void, avr, avr)
 DEF_HELPER_2(vextsh2d, void, avr, avr)
 DEF_HELPER_2(vextsw2d, void, avr, avr)
+DEF_HELPER_2(vnegw, void, avr, avr)
+DEF_HELPER_2(vnegd, void, avr, avr)
 DEF_HELPER_2(vupkhpx, void, avr, avr)
 DEF_HELPER_2(vupklpx, void, avr, avr)
 DEF_HELPER_2(vupkhsb, void, avr, avr)
diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
index b393c30..76cf9b8 100644
--- a/target-ppc/int_helper.c
+++ b/target-ppc/int_helper.c
@@ -1949,6 +1949,18 @@  VEXT_SIGNED(vextsh2d, s64, UINT16_MAX, int16_t, int64_t)
 VEXT_SIGNED(vextsw2d, s64, UINT32_MAX, int32_t, int64_t)
 #undef VEXT_SIGNED
 
+#define VNEG(name, element, mask)                                   \
+void helper_##name(ppc_avr_t *r, ppc_avr_t *b)                      \
+{                                                                   \
+    int i;                                                          \
+    VECTOR_FOR_INORDER_I(i, element) {                              \
+        r->element[i] = (~(b->element[i]) + 1) & mask;              \
+    }                                                               \
+}
+VNEG(vnegw, s32, UINT32_MAX)
+VNEG(vnegd, s64, UINT64_MAX)
+#undef VNEG
+
 #define VSPLTI(suffix, element, splat_type)                     \
     void helper_vspltis##suffix(ppc_avr_t *r, uint32_t splat)   \
     {                                                           \
diff --git a/target-ppc/translate/vmx-impl.inc.c b/target-ppc/translate/vmx-impl.inc.c
index c8998f3..563f101 100644
--- a/target-ppc/translate/vmx-impl.inc.c
+++ b/target-ppc/translate/vmx-impl.inc.c
@@ -815,6 +815,8 @@  GEN_VXFORM_NOA(vclzb, 1, 28)
 GEN_VXFORM_NOA(vclzh, 1, 29)
 GEN_VXFORM_NOA(vclzw, 1, 30)
 GEN_VXFORM_NOA(vclzd, 1, 31)
+GEN_VXFORM_NOA_2(vnegw, 1, 24, 6)
+GEN_VXFORM_NOA_2(vnegd, 1, 24, 7)
 GEN_VXFORM_NOA_2(vextsb2w, 1, 24, 16)
 GEN_VXFORM_NOA_2(vextsh2w, 1, 24, 17)
 GEN_VXFORM_NOA_2(vextsb2d, 1, 24, 24)
diff --git a/target-ppc/translate/vmx-ops.inc.c b/target-ppc/translate/vmx-ops.inc.c
index 68cba3e..ab64ab2 100644
--- a/target-ppc/translate/vmx-ops.inc.c
+++ b/target-ppc/translate/vmx-ops.inc.c
@@ -215,6 +215,8 @@  GEN_VXFORM_DUAL_INV(vspltish, vinserth, 6, 13, 0x00000000, 0x100000,
 GEN_VXFORM_DUAL_INV(vspltisw, vinsertw, 6, 14, 0x00000000, 0x100000,
                                                PPC_ALTIVEC),
 GEN_VXFORM_300_EXT(vinsertd, 6, 15, 0x100000),
+GEN_VXFORM_300_EO(vnegw, 0x01, 0x18, 0x06),
+GEN_VXFORM_300_EO(vnegd, 0x01, 0x18, 0x07),
 GEN_VXFORM_300_EO(vextsb2w, 0x01, 0x18, 0x10),
 GEN_VXFORM_300_EO(vextsh2w, 0x01, 0x18, 0x11),
 GEN_VXFORM_300_EO(vextsb2d, 0x01, 0x18, 0x18),