search for: elinminated

...ble or controllable manner. Dependencies on such registers can be ignored, and two subsequent reads of their value are not guaranteed to be equal. a. Special case: one could imagine a special register, the reading of which in itself can have side-effects. In such case the reads should not be elinminated or duplicated. [1] In our local repository we have a hook in the subtarget info, which is called with the DAG as its argument after its construction, and where we remove the write-write dependencies on the overflow bit (which we model as a subregister of USR). This is really important for us f...

> On Feb 26, 2016, at 1:54 PM, Matthias Braun <mbraun at apple.com> wrote: > > Let's try this again after some longer offline discussions: > > = Reserved Registers = > The primary use of reserved registers is to hold values required by runtime conventions. Typical examples are the stack pointer, frame pointer maybe TLS base address, GOT address ... > Zero registers

Let's try this again after some longer offline discussions: = Reserved Registers = The primary use of reserved registers is to hold values required by runtime conventions. Typical examples are the stack pointer, frame pointer maybe TLS base address, GOT address ... Zero registers and program counters are an odd special case for which we may be able to provide looser rules. == Rules == 1)