[Bug target/27827] [4.0/4.1 Regression] gcc 4 produces worse x87 code on all platforms than gcc 3

[paolo dot bonzini at lu dot unisi dot ch]

------- Comment #48 from paolo dot bonzini at lu dot unisi dot ch  2006-08-08 07:05 -------
Subject: Re:  [4.0/4.1 Regression] gcc 4 produces worse
 x87 code on all platforms than gcc 3


> In x86/x86-64 world one can be almost sure that the load+execute instruction
> pair will execute (marginaly to noticeably) faster than move+load-and-execute
> instruction pair as the more complex instructions are harder for on-chip
> scheduling (they retire later).
Yes, so far so good and this part has already been committed.  But does 
a *single* load-and-execute instruction execute faster than the two 
instructions in a load+execute sequence?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27827