diff --git a/hotspot/src/share/vm/c1/c1_LinearScan.cpp b/hotspot/src/share/vm/c1/c1_LinearScan.cpp index 38ee82acdd9..ebb06837284 100644 --- a/hotspot/src/share/vm/c1/c1_LinearScan.cpp +++ b/hotspot/src/share/vm/c1/c1_LinearScan.cpp @@ -2619,6 +2619,24 @@ int LinearScan::append_scope_value_for_operand(LIR_Opr opr, GrowableArrayfpu_regname(opr->fpu_regnr()); +#ifndef __SOFTFP__ +#ifndef VM_LITTLE_ENDIAN + if (! float_saved_as_double) { + // On big endian system, we may have an issue if float registers use only + // the low half of the (same) double registers. + // Both the float and the double could have the same regnr but would correspond + // to two different addresses once saved. + + // get next safely (no assertion checks) + VMReg next = VMRegImpl::as_VMReg(1+rname->value()); + if (next->is_reg() && + (next->as_FloatRegister() == rname->as_FloatRegister())) { + // the back-end does use the same numbering for the double and the float + rname = next; // VMReg for the low bits, e.g. the real VMReg for the float + } + } +#endif +#endif LocationValue* sv = new LocationValue(Location::new_reg_loc(loc_type, rname)); scope_values->append(sv);