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I found one instance of the problem in some leftover output files:As a first guess, I would think that you are testing three inter-basic-block CSE passes (path following in CSE, and the two GCSE passes). fwprop adds a second GCSE pass to mimic at least part of what CSE path following did. Testing fwprop + expensive-cse means getting path following + two GCSE passes.
@@ -8253,12 +8159,11 @@ if cc jump L$L$1478; - R0 = B [P5+2] (Z); - cc =R0==0; + R1 = B [P5+2] (Z); + cc =R1==0; if !cc jump L$L$1478 (bp); R0 = B [P4+2] (Z); cc =R0==0; - R1 = 0 (X); R0 = 1 (X); if cc R0 =R1; /* movsicc-2a */ jump.s L$L$1501;
Before is fwprop, after is fwprop + expensive-cse.
I made some experiments with a reduced testcase:
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