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author | Tom Musta <tommusta@gmail.com> | 2014-01-07 10:05:54 -0600 |
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committer | Alexander Graf <agraf@suse.de> | 2014-03-05 03:06:40 +0100 |
commit | a98eb9e99df4c11966fcd56cbcb6f06e6f413a89 (patch) | |
tree | 3edf5301d956aec9607ee555167967b5e343076e /target-ppc/int_helper.c | |
parent | 6a4fda3358ca5a21e17d553074f74d512745c4f6 (diff) | |
download | qemu-a98eb9e99df4c11966fcd56cbcb6f06e6f413a89.zip qemu-a98eb9e99df4c11966fcd56cbcb6f06e6f413a89.tar.gz qemu-a98eb9e99df4c11966fcd56cbcb6f06e6f413a89.tar.bz2 |
target-ppc: Add ISA 2.06 divwe[o] Instructions
This patch addes the signed Divide Word Extended instructions
which were introduced in Power ISA 2.06B.
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/int_helper.c')
-rw-r--r-- | target-ppc/int_helper.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c index 45586be..71db3fb 100644 --- a/target-ppc/int_helper.c +++ b/target-ppc/int_helper.c @@ -72,6 +72,38 @@ target_ulong helper_divweu(CPUPPCState *env, target_ulong ra, target_ulong rb, return (target_ulong)rt; } +target_ulong helper_divwe(CPUPPCState *env, target_ulong ra, target_ulong rb, + uint32_t oe) +{ + int64_t rt = 0; + int overflow = 0; + + int64_t dividend = (int64_t)ra << 32; + int64_t divisor = (int64_t)((int32_t)rb); + + if (unlikely((divisor == 0) || + ((divisor == -1ull) && (dividend == INT64_MIN)))) { + overflow = 1; + } else { + rt = dividend / divisor; + overflow = rt != (int32_t)rt; + } + + if (unlikely(overflow)) { + rt = 0; /* Undefined */ + } + + if (oe) { + if (unlikely(overflow)) { + env->so = env->ov = 1; + } else { + env->ov = 0; + } + } + + return (target_ulong)rt; +} + #if defined(TARGET_PPC64) uint64_t helper_divdeu(CPUPPCState *env, uint64_t ra, uint64_t rb, uint32_t oe) |