The instruction description says "It is loaded without rounding errors." which implies we should have the widest rounding mode possible.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/888 Signed-off-by: Alex Bennée <alex.ben...@linaro.org> --- target/i386/tcg/fpu_helper.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/target/i386/tcg/fpu_helper.c b/target/i386/tcg/fpu_helper.c index cdd8e9f947..d986fd5792 100644 --- a/target/i386/tcg/fpu_helper.c +++ b/target/i386/tcg/fpu_helper.c @@ -250,11 +250,15 @@ void helper_fildl_ST0(CPUX86State *env, int32_t val) void helper_fildll_ST0(CPUX86State *env, int64_t val) { int new_fpstt; + FloatX80RoundPrec old = get_floatx80_rounding_precision(&env->fp_status); + set_floatx80_rounding_precision(floatx80_precision_x, &env->fp_status); new_fpstt = (env->fpstt - 1) & 7; env->fpregs[new_fpstt].d = int64_to_floatx80(val, &env->fp_status); env->fpstt = new_fpstt; env->fptags[new_fpstt] = 0; /* validate stack entry */ + + set_floatx80_rounding_precision(old, &env->fp_status); } uint32_t helper_fsts_ST0(CPUX86State *env) -- 2.30.2