Hello, With my patch to visit insns in topological order in init_alias_analysis, an issue in postreload-cse got exposed: Blocks may become unreachable between calls of reload_cse_regs_1 but no CFG cleanups are scheduled between them, resulting in an ICE in pre_and_rev_post_order_compute at an assert that all blocks have been visited in the depth first search on the CFG.
This patch fixes the problem by deleting unreachable basic blocks if edges were purged during a reload-cse transformation on an insn. I didn't add a test case because reliably triggering problems this late in the pass pipeline is so hard. Bootstrapped&tested on powerpc64-unknown-linux-gnu. OK for trunk? Ciao! Steven
PR54385.diff
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