On sh, the following code: --------------------------------------------------------------------- typedef unsigned long long ull; int __attribute__((noinline)) foo (int x1, int x2, int x3, int x4, int x5, int x6, int x7, int x8) { return x1 + x2 + x3 + x4 + x5 + x6 + x7 + x8; } ull __attribute__((noinline)) bar (ull x) { return x << foo (1, 2, 1, 3, 1, 4, 1, 5); } int main (void) { if (bar (0x123456789ULL) != (0x123456789ULL << 18)) abort (); exit (0); } ---------------------------------------------------------------------
is miscompiled; we do not pop the arguments from the call to foo(). The problem is that the pop was done by an aborted attempt to do the shift using OPTAB_DIRECT. 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] Missed argument pop after doubleword shift Product: gcc Version: 4.0.0 Status: UNCONFIRMED Keywords: wrong-code Severity: critical 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=28403