[Bug rtl-optimization/21150] New: Suboptimal byte extraction from larger integers

[vda at port dot imtp dot ilyichevsk dot odessa dot ua]

Bytes are typically extracted from e.g. u64's by something like

#define D5(v) (((v) >> 40) & 0xff)

Testcase shows that gcc does not optimize this "good enough".

-- 
           Summary: Suboptimal byte extraction from larger integers
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: vda at port dot imtp dot ilyichevsk dot odessa dot ua
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i386-pc-linux-gnu
  GCC host triplet: i386-pc-linux-gnu
GCC target triplet: i386-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21150