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2003-04-16 Roger Sayle <roger@eyesopen.com> * c-semantics.c (find_reachable_label): New function to find a potentially reachable label in an expression. (expand_unreachable_if_stmt): Similar to expand_if_stmt but assumes the start of the IF_STMT is unreachable (dead) code. (expand_unreachable_stmt): Similar to expand_stmt but assumes the start of the statement list is unreachable (dead) code. (genrtl_if_stmt): If the controlling expression of the IF is constant, use expand_unreachable_stmt for the THEN or ELSE clause as appropriate. (genrtl_switch_stmt): Use expand_unreachable_stmt to expand the body of a SWITCH statement. (expand_stmt): The code immediately following a "return", "break", "continue" or "goto" is unreachable. * Makefile.in (c-semantics.o): Depend upon tree-inline.h. * gcc.dg/Wunreachable-5.c: New test case for PR c/10175. * gcc.c-torture/execute/medce-1.c: New test case. * gcc.c-torture/execute/medce-2.c: New test case. From-SVN: r65715
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