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| -rw-r--r-- | tcg/README | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tcg/README b/tcg/README index e672258faf..3d6c170efe 100644 --- a/tcg/README +++ b/tcg/README @@ -323,6 +323,29 @@ st32_i64 t0, t1, offset write(t0, t1 + offset) Write 8, 16, 32 or 64 bits to host memory. +********* 64-bit target on 32-bit host support + +The following opcodes are internal to TCG. Thus they are to be implemented by +32-bit host code generators, but are not to be emitted by guest translators. +They are emitted as needed by inline functions within "tcg-op.h". + +* brcond2_i32 cond, t0_low, t0_high, t1_low, t1_high, label + +Similar to brcond, except that the 64-bit values T0 and T1 +are formed from two 32-bit arguments. + +* add2_i32 t0_low, t0_high, t1_low, t1_high, t2_low, t2_high +* sub2_i32 t0_low, t0_high, t1_low, t1_high, t2_low, t2_high + +Similar to add/sub, except that the 64-bit inputs T1 and T2 are +formed from two 32-bit arguments, and the 64-bit output T0 +is returned in two 32-bit outputs. + +* mulu2_i32 t0_low, t0_high, t1, t2 + +Similar to mul, except two 32-bit (unsigned) inputs T1 and T2 yielding +the full 64-bit product T0. The later is returned in two 32-bit outputs. + ********* QEMU specific operations * tb_exit t0 |