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transforms.cfg_simplifier: handle phi and branch_if properly.
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@ -18,5 +18,15 @@ class CFGSimplifier:
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if len(block.instructions) == 1 and \
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isinstance(block.terminator(), ir.Branch):
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successor, = block.successors()
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for insn in set(block.uses):
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if isinstance(insn, ir.BranchIf) and \
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((insn.if_true() == block and insn.if_false() == successor) or
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(insn.if_true() == successor and insn.if_false() == block)):
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# Our IR doesn't tolerate branch_if %c, %b, %b
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insn.replace_with(ir.Branch(successor))
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elif isinstance(insn, ir.Phi):
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insn.remove_incoming_block(block)
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block.replace_all_uses_with(successor)
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block.erase()
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