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HJ has verified that this patch fixes a testsuite failure on ia64. The problem occurs when computing the graph of which insn feeds which - we use dead_or_set_p to determine whether i1 clobbers the register set by i0, but that fails if i1 sets a ZERO_EXTRACT. Using reg_overlap_mentioned_p instead should solve it. Bootstrapped and regression tested on i686-linux, ok? Bernd
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