Optimize Altivec instruction vclzd (Vector Count Leading Zeros Doubleword).
This instruction counts the number of leading zeros of each doubleword element
in source register and places result in the appropriate doubleword element of
destination register.
Using tcg-s count leading zeros instruction two times(once for each
doubleword element of source register vB) and placing result in
appropriate doubleword element of destination register vD.
Signed-off-by: Stefan Brankovic <stefan.branko...@rt-rk.com>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
---
target/ppc/helper.h | 1 -
target/ppc/int_helper.c | 3 ---
target/ppc/translate/vmx-impl.inc.c | 28 +++++++++++++++++++++++++++-
3 files changed, 27 insertions(+), 5 deletions(-)
diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index cf1af51..57a954c 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -307,7 +307,6 @@ DEF_HELPER_4(vctsxs, void, env, avr, avr, i32)
DEF_HELPER_2(vclzb, void, avr, avr)
DEF_HELPER_2(vclzh, void, avr, avr)
DEF_HELPER_2(vclzw, void, avr, avr)
-DEF_HELPER_2(vclzd, void, avr, avr)
DEF_HELPER_2(vctzb, void, avr, avr)
DEF_HELPER_2(vctzh, void, avr, avr)
DEF_HELPER_2(vctzw, void, avr, avr)
diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c
index 87e3062..210e8be 100644
--- a/target/ppc/int_helper.c
+++ b/target/ppc/int_helper.c
@@ -1824,17 +1824,14 @@ VUPK(lsw, s64, s32, UPKLO)
#define clzb(v) ((v) ? clz32((uint32_t)(v) << 24) : 8)
#define clzh(v) ((v) ? clz32((uint32_t)(v) << 16) : 16)
#define clzw(v) clz32((v))
-#define clzd(v) clz64((v))
VGENERIC_DO(clzb, u8)
VGENERIC_DO(clzh, u16)
VGENERIC_DO(clzw, u32)
-VGENERIC_DO(clzd, u64)
#undef clzb
#undef clzh
#undef clzw
-#undef clzd
#define ctzb(v) ((v) ? ctz32(v) : 8)
#define ctzh(v) ((v) ? ctz32(v) : 16)
diff --git a/target/ppc/translate/vmx-impl.inc.c
b/target/ppc/translate/vmx-impl.inc.c
index d9b346b..50d906b 100644
--- a/target/ppc/translate/vmx-impl.inc.c
+++ b/target/ppc/translate/vmx-impl.inc.c
@@ -740,6 +740,32 @@ static void trans_vgbbd(DisasContext *ctx)
tcg_temp_free_i64(avr[1]);
}
+/*
+ * vclzd VRT,VRB - Vector Count Leading Zeros Doubleword
+ *
+ * Counting the number of leading zero bits of each doubleword element in
source
+ * register and placing result in appropriate doubleword element of destination
+ * register.
+ */
+static void trans_vclzd(DisasContext *ctx)
+{
+ int VT = rD(ctx->opcode);
+ int VB = rB(ctx->opcode);
+ TCGv_i64 avr = tcg_temp_new_i64();
+
+ /* high doubleword */
+ get_avr64(avr, VB, true);
+ tcg_gen_clzi_i64(avr, avr, 64);
+ set_avr64(VT, avr, true);
+
+ /* low doubleword */
+ get_avr64(avr, VB, false);
+ tcg_gen_clzi_i64(avr, avr, 64);
+ set_avr64(VT, avr, false);
+
+ tcg_temp_free_i64(avr);
+}
+
GEN_VXFORM(vmuloub, 4, 0);
GEN_VXFORM(vmulouh, 4, 1);
GEN_VXFORM(vmulouw, 4, 2);
@@ -1256,7 +1282,7 @@ GEN_VAFORM_PAIRED(vmaddfp, vnmsubfp, 23)
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_TRANS(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)
--
2.7.4
