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The problem here is even if last_and_only_stmt returns a statement,
the bb might still contain a phi node which defines a ssa name
which is used in that statement so we need to add a check to make sure
that the phi nodes are empty for the middle bbs in both the
`CMP?MINMAX:MINMAX` case and the `CMP?MINMAX:B` cases.
Bootstrapped and tested on x86_64_linux-gnu with no regressions.
PR tree-optimization/115143
gcc/ChangeLog:
* tree-ssa-phiopt.cc (minmax_replacement): Check for empty
phi nodes for middle bbs for the case where middle bb is not empty.
gcc/testsuite/ChangeLog:
* gcc.c-torture/compile/pr115143-1.c: New test.
* gcc.c-torture/compile/pr115143-2.c: New test.
* gcc.c-torture/compile/pr115143-3.c: New test.
Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>
(cherry picked from commit 9ff8f04133)
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