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18913db07a
When optimizing for size, replace "addl $4, %esp" and "addl $8, %esp" following a call by one or two pops, respectively. We don't try to do it in general, but only when the stack adjustment immediately follows a call - which is the most common case. That allows taking a short-cut when trying to find a free register to pop into, instead of a full-blown liveness check. If the adjustment immediately follows a call, then every register the call clobbers but doesn't define should be dead at that point, and can be used. Differential Revision: http://reviews.llvm.org/D11749 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244578 91177308-0d34-0410-b5e6-96231b3b80d8