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When propagating a multi-word register into an access with a smaller mode the can_change_mode backend hook is already consulted for the original register. This however is also required for the intermediate copy in copy_regno which might use a different register class. gcc/ChangeLog: PR rtl-optimization/101260 * regcprop.cc (maybe_mode_change): Invoke mode_change_ok also for copy_regno. gcc/testsuite/ChangeLog: PR rtl-optimization/101260 * gcc.target/s390/pr101260.c: New testcase. |
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| c++tools | ||
| config | ||
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