From: Yonggang Luo <luoyongg...@gmail.com> Just post as an idea to improve PPC fp performance. With this idea, we have no need to adjust the helper orders.
Signed-off-by: Yonggang Luo <luoyongg...@gmail.com> --- target/ppc/fpu_helper.c | 44 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c index 2bd49a2cdf..79051e4540 100644 --- a/target/ppc/fpu_helper.c +++ b/target/ppc/fpu_helper.c @@ -926,6 +926,17 @@ static void float_invalid_op_addsub(CPUPPCState *env, bool set_fpcc, /* fadd - fadd. */ float64 helper_fadd(CPUPPCState *env, float64 arg1, float64 arg2) { + CPU_DoubleU u1, u2; + + u1.d = arg1; + u2.d = arg2; + CPU_DoubleU retDouble; + retDouble.nd = u1.nd + u2.nd; + if (likely(float64_is_zero_or_normal(retDouble.d))) + { + /* TODO: Handling inexact */ + return retDouble.d; + } float64 ret = float64_add(arg1, arg2, &env->fp_status); int status = get_float_exception_flags(&env->fp_status); @@ -941,6 +952,17 @@ float64 helper_fadd(CPUPPCState *env, float64 arg1, float64 arg2) /* fsub - fsub. */ float64 helper_fsub(CPUPPCState *env, float64 arg1, float64 arg2) { + CPU_DoubleU u1, u2; + + u1.d = arg1; + u2.d = arg2; + CPU_DoubleU retDouble; + retDouble.nd = u1.nd - u2.nd; + if (likely(float64_is_zero_or_normal(retDouble.d))) + { + /* TODO: Handling inexact */ + return retDouble.d; + } float64 ret = float64_sub(arg1, arg2, &env->fp_status); int status = get_float_exception_flags(&env->fp_status); @@ -967,6 +989,17 @@ static void float_invalid_op_mul(CPUPPCState *env, bool set_fprc, /* fmul - fmul. */ float64 helper_fmul(CPUPPCState *env, float64 arg1, float64 arg2) { + CPU_DoubleU u1, u2; + + u1.d = arg1; + u2.d = arg2; + CPU_DoubleU retDouble; + retDouble.nd = u1.nd * u2.nd; + if (likely(float64_is_zero_or_normal(retDouble.d))) + { + /* TODO: Handling inexact */ + return retDouble.d; + } float64 ret = float64_mul(arg1, arg2, &env->fp_status); int status = get_float_exception_flags(&env->fp_status); @@ -997,6 +1030,17 @@ static void float_invalid_op_div(CPUPPCState *env, bool set_fprc, /* fdiv - fdiv. */ float64 helper_fdiv(CPUPPCState *env, float64 arg1, float64 arg2) { + CPU_DoubleU u1, u2; + + u1.d = arg1; + u2.d = arg2; + CPU_DoubleU retDouble; + retDouble.nd = u1.nd / u2.nd; + if (likely(float64_is_zero_or_normal(retDouble.d))) + { + /* TODO: Handling inexact */ + return retDouble.d; + } float64 ret = float64_div(arg1, arg2, &env->fp_status); int status = get_float_exception_flags(&env->fp_status); -- 2.23.0.windows.1