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This patch stops combine from changing the mode of an existing register in-place if doing so would change the size of the underlying register allocation size, as given by REGMODE_NATURAL_SIZE. Without this, many tests fail in adjust_reg_mode after SVE is added. One example is gcc.c-torture/compile/20090401-1.c. 2017-10-13 Richard Sandiford <richard.sandiford@linaro.org> Alan Hayward <alan.hayward@arm.com> David Sherwood <david.sherwood@arm.com> gcc/ * combine.c (can_change_dest_mode): Reject changes in REGMODE_NATURAL_SIZE. Co-Authored-By: Alan Hayward <alan.hayward@arm.com> Co-Authored-By: David Sherwood <david.sherwood@arm.com> From-SVN: r253717
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