[Bug inline-asm/10396] Constraint alternatives cause error " `asm' operand requires impossible reload"

[pgonzalez at bluel dot com]

------- Additional Comments From pgonzalez at bluel dot com  2004-01-14 23:44 -------
(In reply to comment #11)
> Which is only out by a couple of cycles (A couple of redundant mov insns). 
> However, by not using an ASM you allow the compiler to schedule the 
instructions
> independently, and may also expose additional optimization opportunities. 

True, although the purpose of the inline assembly is to recover exactly those 
missing cycles.  :-)  I should note also that the simple example above is 
representative of similar problems with more complex cases (e.g. fixed-point 
vector multiplication).  The workaround we're using right now is a manually-
enabled preprocessor flag that reduces the constraint count in files that 
failed to compile without it.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10396