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| author | Tom Musta <tommusta@gmail.com> | 2014-01-07 10:06:08 -0600 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-03-05 03:06:43 +0100 |
| commit | 6d41d146c92e99e21ef267be4c4b9893940e0838 (patch) | |
| tree | f9f231dabd54853197f4060eed0304ac75bbc113 /target-ppc/fpu_helper.c | |
| parent | da29cb7bc7b62c14a69a104f91867edf9ce88543 (diff) | |
| download | qemu-6d41d146c92e99e21ef267be4c4b9893940e0838.tar.gz qemu-6d41d146c92e99e21ef267be4c4b9893940e0838.tar.bz2 qemu-6d41d146c92e99e21ef267be4c4b9893940e0838.zip | |
target-ppc: Add ISA 2.06 ftsqrt
This patch adds the Floating Point Test for Square Root instruction
which was introduced in Power ISA 2.06.
Signed-off-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/fpu_helper.c')
| -rw-r--r-- | target-ppc/fpu_helper.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/target-ppc/fpu_helper.c b/target-ppc/fpu_helper.c index 772b135600..4ef3e2fb0c 100644 --- a/target-ppc/fpu_helper.c +++ b/target-ppc/fpu_helper.c @@ -1039,6 +1039,37 @@ uint32_t helper_ftdiv(uint64_t fra, uint64_t frb) return 0x8 | (fg_flag ? 4 : 0) | (fe_flag ? 2 : 0); } +uint32_t helper_ftsqrt(uint64_t frb) +{ + int fe_flag = 0; + int fg_flag = 0; + + if (unlikely(float64_is_infinity(frb) || float64_is_zero(frb))) { + fe_flag = 1; + fg_flag = 1; + } else { + int e_b = ppc_float64_get_unbiased_exp(frb); + + if (unlikely(float64_is_any_nan(frb))) { + fe_flag = 1; + } else if (unlikely(float64_is_zero(frb))) { + fe_flag = 1; + } else if (unlikely(float64_is_neg(frb))) { + fe_flag = 1; + } else if (!float64_is_zero(frb) && (e_b <= (-1022+52))) { + fe_flag = 1; + } + + if (unlikely(float64_is_zero_or_denormal(frb))) { + /* XB is not zero because of the above check and */ + /* therefore must be denormalized. */ + fg_flag = 1; + } + } + + return 0x8 | (fg_flag ? 4 : 0) | (fe_flag ? 2 : 0); +} + void helper_fcmpu(CPUPPCState *env, uint64_t arg1, uint64_t arg2, uint32_t crfD) { |