On sh (and other targets with no variable shift):
typedef unsigned long long ull;
ull foo (ull x, int y) { return x << y; }
is implemented using several calls to the SImode shift
routines, rather than one call to the DImode routine.
A similar problem affects constant shifts if the target
does not have a direct implementation.
3.4 did not have this problem; it's a 4.x regression
introduced by my 2004-09-04 patch.
--
Summary: [4.0/4.1/4.2 Regression] Doubleword shifts implemented
using word_mode libcalls
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rsandifo at gcc dot gnu dot org
GCC target triplet: sh-elf
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28402
