diff options
| -rw-r--r-- | tcg/README | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/tcg/README b/tcg/README index f1782123b7..776e9259e3 100644 --- a/tcg/README +++ b/tcg/README @@ -36,6 +36,12 @@ or a memory location which is stored in a register outside QEMU TBs A TCG "basic block" corresponds to a list of instructions terminated by a branch instruction. +An operation with "undefined behavior" may result in a crash. + +An operation with "unspecified behavior" shall not crash. However, +the result may be one of several possibilities so may be considered +an "undefined result". + 3) Intermediate representation 3.1) Introduction @@ -239,23 +245,25 @@ t0=t1|~t2 * shl_i32/i64 t0, t1, t2 -t0=t1 << t2. Undefined behavior if t2 < 0 or t2 >= 32 (resp 64) +t0=t1 << t2. Unspecified behavior if t2 < 0 or t2 >= 32 (resp 64) * shr_i32/i64 t0, t1, t2 -t0=t1 >> t2 (unsigned). Undefined behavior if t2 < 0 or t2 >= 32 (resp 64) +t0=t1 >> t2 (unsigned). Unspecified behavior if t2 < 0 or t2 >= 32 (resp 64) * sar_i32/i64 t0, t1, t2 -t0=t1 >> t2 (signed). Undefined behavior if t2 < 0 or t2 >= 32 (resp 64) +t0=t1 >> t2 (signed). Unspecified behavior if t2 < 0 or t2 >= 32 (resp 64) * rotl_i32/i64 t0, t1, t2 -Rotation of t2 bits to the left. Undefined behavior if t2 < 0 or t2 >= 32 (resp 64) +Rotation of t2 bits to the left. +Unspecified behavior if t2 < 0 or t2 >= 32 (resp 64) * rotr_i32/i64 t0, t1, t2 -Rotation of t2 bits to the right. Undefined behavior if t2 < 0 or t2 >= 32 (resp 64) +Rotation of t2 bits to the right. +Unspecified behavior if t2 < 0 or t2 >= 32 (resp 64) ********* Misc |