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r188163 used CLC to implement memcmp. Code that compares the result directly against zero can test the CC value produced by CLC, but code that needs an integer result must use IPM. The sequence I'd used was: ipm <reg> sll <reg>, 2 sra <reg>, 30 but I'd forgotten that this inverts the order, so that CC==1 ("less") becomes an integer greater than zero, and CC==2 ("greater") becomes an integer less than zero. This sequence should only be used if the CLC arguments are reversed to compensate. The problem then is that the branch condition must also be reversed when testing the CLC result directly. Rather than do that, I went for a different sequence that works with the natural CLC order: ipm <reg> srl <reg>, 28 rll <reg>, <reg>, 31 One advantage of this is that it doesn't clobber CC. A disadvantage is that any sign extension to 64 bits must be done separately, rather than being folded into the shifts. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188538 91177308-0d34-0410-b5e6-96231b3b80d8 |
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