Alexandre Oliva
828ca3d835
The ifcombine pass may move a conditional access to an uninitialized value before the condition that ensures it is always well-defined, thus introducing undefined behavior. Stop it from doing so. for gcc/ChangeLog PR tree-optimization/68083 * tree-ssa-ifcombine.c: Include tree-ssa.h. (bb_no_side_effects_p): Test for undefined uses too. * tree-ssa.c (gimple_uses_undefined_value_p): New. * tree-ssa.h (gimple_uses_undefined_value_p): Declare. for gcc/testsuite/ChangeLog PR tree-optimization/68083 * gcc.dg/torture/pr68083.c: New. From Zhendong Su. From-SVN: r229690
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