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Even the latest version of MASM does not support the CMOVcc instructions (unless they are named something different my Microsoft ?). Using the CMOVcc instruction rules the X86 out for compilation to pre Pentium Pro CPU's. Aaron -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/...

On Sat, 9 Jul 2005, Aaron Gray wrote: > Even the latest version of MASM does not support the CMOVcc instructions > (unless they are named something different my Microsoft ?). Using the > CMOVcc instruction rules the X86 out for compilation to pre Pentium Pro > CPU's. You probably have to emit a directive that enables ppro and higher opcodes. Maybe something like this will work:...

...ulating predicate state involves significant cost. There are several key optimizations we employ to minimize this and various alternatives that present different tradeoffs in the generated code. First, we work to reduce the number of instructions used to track the state: * Rather than inserting a `cmovCC` instruction along every conditional edge in the original program, we track each set of condition flags we need to capture prior to entering each basic block and reuse a common `cmovCC` sequence for those. * We could further reuse suffixes when there are multiple `cmovCC` instructions r...

We (the folks working on Souper) would appreciate any feedback on these IR-level superoptimizer results: http://blog.regehr.org/extra_files/souper-jul-15.html My impression is that while there's clearly plenty of material in here that doesn't want to get implemented in an opt pass, there are a number of gems hiding in there that are worth implementing. Blog post containing