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src/cpu/aarch64/vm/macroAssembler_aarch64.cpp
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rev 8690 : 8131362: aarch64: C2 does not handle large stack offsets
Summary: change spill code to allow large offsets
Reviewed-by: duke
@@ -2304,10 +2304,32 @@
} else {
return Address(r, r1, ext);
}
}
+Address MacroAssembler::spill_address(int size, int offset)
+{
+ assert(offset >= 0, "spill to negative address?");
+ // Offset reachable ?
+ // Not aligned - 9 bits signed offset
+ // Aligned - 12 bits unsigned offset shifted
+ Register base = sp;
+ if ((offset & (size-1)) && offset >= (1<<8)) {
+ add(rscratch2, base, offset & ((1<<12)-1));
+ base = rscratch2;
+ offset &= ~((1<<12)-1);
+ }
+
+ if (offset >= (1<<12) * size) {
+ add(rscratch2, base, offset & (((1<<12)-1)<<12));
+ base = rscratch2;
+ offset &= ~(((1<<12)-1)<<12);
+ }
+
+ return Address(base, offset);
+}
+
/**
* Multiply 64 bit by 64 bit first loop.
*/
void MacroAssembler::multiply_64_x_64_loop(Register x, Register xstart, Register x_xstart,
Register y, Register y_idx, Register z,
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