https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312
--- Comment #20 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to John Paul Adrian Glaubitz from comment #12)
> Created attachment 36224 [details]
> Stage 3 compiled version of ctfeexpr.dmd.o (unstripped)
(In reply to John Paul Adrian Glaubitz from comment #11)
> Created attachment 36223 [details]
> Stage 2 compiled version of ctfeexpr.dmd.o (unstripped)
I could spot only one difference:
stage2:
cmp/pz r1 // T = r1 >= 0
stage3:
not r1,r0
shll r0 // T = ~r0 >> 31
Both versions are functionally equivalent.
The increase from 1 insn to 2 insns then seems to cause other differences,
which are mainly only offsets. Sometimes register allocation could also be
affected.
The question is why this is happening...
