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Officially, register X31 does not exist. The code is zeroing out a location and thus actually needs XZR. LLVM seems to automatically translate X31 into XZR when compiling the code, but GCC (tested 7.3.0) refuses to accept the instruction: ../../third_party/crashpad/crashpad/util/misc/capture_context_linux.S: Assembler messages: ../../third_party/crashpad/crashpad/util/misc/capture_context_linux.S:291: Error: operand 1 must be an integer register -- `str x31,[x0,#0xb0]' Bug: chromium:819294 Change-Id: I85be3923ac56fca6e3ec59d7e22b2223cfc8fa63 Reviewed-on: https://chromium-review.googlesource.com/1078818 Reviewed-by: Joshua Peraza <jperaza@chromium.org> Commit-Queue: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>