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cc2003cd87
In this case we are not removing convert to a bigger size back to the same size (or smaller) if signedness does not match. For an example: ``` signed char _1; ... _1 = *a_4(D); b_5 = (short unsigned int) _1; _2 = (unsigned char) b_5; ``` The inner cast is not needed and can be removed but was not. The match pattern for removing the extra cast is overly complex so decided to add a new case for rather than trying to modify the current if statement here. Committed as approved. Bootstrapped and tested on x86_64-linux-gnu with no regressions. gcc/ChangeLog: PR tree-optimization/93044 * match.pd (nested int casts): A truncation (to the same size or smaller) can always remove the inner cast. gcc/testsuite/ChangeLog: PR tree-optimization/93044 * gcc.dg/tree-ssa/cast-1.c: New test. * gcc.dg/tree-ssa/cast-2.c: New test.
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