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X-Received-From: 2a00:1450:400c:c09::242 Subject: [Qemu-devel] [PATCH v3 21/31] arm/translate-a64: add FP16 FNEG/FABS to simd_two_reg_misc_fp16 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , richard.henderson@linaro.org, qemu-devel@nongnu.org, Peter Maydell Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_6 Z_629925259 SPT_0 Neither of these operations alter the floating point status registers so we can do a pure bitwise operation, either squashing any sign bit (ABS) or inverting it (NEG). Signed-off-by: Alex Benn=C3=A9e Reviewed-by: Richard Henderson --- v3 - fixup re-base conflicts - make both operations pure bitwise TCG --- target/arm/translate-a64.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c index abe23f7d3f..00b04d34f9 100644 --- a/target/arm/translate-a64.c +++ b/target/arm/translate-a64.c @@ -11262,6 +11262,7 @@ static void disas_simd_two_reg_misc_fp16(DisasConte= xt *s, uint32_t insn) TCGv_i32 tcg_rmode =3D NULL; TCGv_ptr tcg_fpstatus =3D NULL; bool need_rmode =3D false; + bool need_fpst =3D true; int rmode; =20 if (!arm_dc_feature(s, ARM_FEATURE_V8_FP16)) { @@ -11380,6 +11381,10 @@ static void disas_simd_two_reg_misc_fp16(DisasCont= ext *s, uint32_t insn) need_rmode =3D true; rmode =3D FPROUNDING_ZERO; break; + case 0x2f: /* FABS */ + case 0x6f: /* FNEG */ + need_fpst =3D false; + break; default: fprintf(stderr, "%s: insn %#04x fpop %#2x\n", __func__, insn, fpop= ); g_assert_not_reached(); @@ -11403,7 +11408,7 @@ static void disas_simd_two_reg_misc_fp16(DisasConte= xt *s, uint32_t insn) return; } =20 - if (need_rmode) { + if (need_rmode || need_fpst) { tcg_fpstatus =3D get_fpstatus_ptr(true); } =20 @@ -11433,6 +11438,9 @@ static void disas_simd_two_reg_misc_fp16(DisasConte= xt *s, uint32_t insn) case 0x7b: /* FCVTZU */ gen_helper_advsimd_f16touinth(tcg_res, tcg_op, tcg_fpstatus); break; + case 0x6f: /* FNEG */ + tcg_gen_xori_i32(tcg_res, tcg_op, 0x8000); + break; default: g_assert_not_reached(); } @@ -11476,6 +11484,12 @@ static void disas_simd_two_reg_misc_fp16(DisasCont= ext *s, uint32_t insn) case 0x59: /* FRINTX */ gen_helper_advsimd_rinth_exact(tcg_res, tcg_op, tcg_fpstat= us); break; + case 0x2f: /* FABS */ + tcg_gen_andi_i32(tcg_res, tcg_op, 0x7fff); + break; + case 0x6f: /* FNEG */ + tcg_gen_xori_i32(tcg_res, tcg_op, 0x8000); + break; default: g_assert_not_reached(); } --=20 2.15.1