From 1872588ede5770751ebc0e1df9909c8a785cb549 Mon Sep 17 00:00:00 2001 From: Stefan Brankovic Date: Mon, 15 Jul 2019 16:22:52 +0200 Subject: [PATCH] target/ppc: Optimize emulation of vclzw instruction Optimize Altivec instruction vclzw (Vector Count Leading Zeros Word). This instruction counts the number of leading zeros of each word element in source register and places result in the appropriate word element of destination register. Counting is to be performed in four iterations of for loop(one for each word elemnt of source register vB). Every iteration consists of loading appropriate word element from source register, counting leading zeros with tcg_gen_clzi_i32, and saving the result in appropriate word element of destination register. Signed-off-by: Stefan Brankovic Reviewed-by: Richard Henderson Message-Id: <1563200574-11098-7-git-send-email-stefan.brankovic@rt-rk.com> Signed-off-by: David Gibson --- 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 e203f76bf1..54ea9b9500 100644 --- a/target/ppc/helper.h +++ b/target/ppc/helper.h @@ -310,7 +310,6 @@ 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(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 b82765db33..46deb57a34 100644 --- a/target/ppc/int_helper.c +++ b/target/ppc/int_helper.c @@ -1819,15 +1819,12 @@ 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)) VGENERIC_DO(clzb, u8) VGENERIC_DO(clzh, u16) -VGENERIC_DO(clzw, u32) #undef clzb #undef clzh -#undef clzw #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 3372c2c3d3..0d71c10428 100644 --- a/target/ppc/translate/vmx-impl.inc.c +++ b/target/ppc/translate/vmx-impl.inc.c @@ -742,6 +742,32 @@ static void trans_vgbbd(DisasContext *ctx) tcg_temp_free_i64(avr[1]); } +/* + * vclzw VRT,VRB - Vector Count Leading Zeros Word + * + * Counting the number of leading zero bits of each word element in source + * register and placing result in appropriate word element of destination + * register. + */ +static void trans_vclzw(DisasContext *ctx) +{ + int VT = rD(ctx->opcode); + int VB = rB(ctx->opcode); + TCGv_i32 tmp = tcg_temp_new_i32(); + int i; + + /* Perform count for every word element using tcg_gen_clzi_i32. */ + for (i = 0; i < 4; i++) { + tcg_gen_ld_i32(tmp, cpu_env, + offsetof(CPUPPCState, vsr[32 + VB].u64[0]) + i * 4); + tcg_gen_clzi_i32(tmp, tmp, 32); + tcg_gen_st_i32(tmp, cpu_env, + offsetof(CPUPPCState, vsr[32 + VT].u64[0]) + i * 4); + } + + tcg_temp_free_i32(tmp); +} + /* * vclzd VRT,VRB - Vector Count Leading Zeros Doubleword * @@ -1283,7 +1309,7 @@ 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_TRANS(vclzw, 1, 30) GEN_VXFORM_TRANS(vclzd, 1, 31) GEN_VXFORM_NOA_2(vnegw, 1, 24, 6) GEN_VXFORM_NOA_2(vnegd, 1, 24, 7)