[PATCH] D10826: Fix AArch64 prologue for empty frame with dynamic allocas

[Evgeniy Stepanov]

eugenis added inline comments.

================
Comment at: lib/Target/AArch64/AArch64FrameLowering.cpp:361-362
@@ -357,4 +360,4 @@
+    assert(MF.getRegInfo().isPhysRegUsed(scratchSPReg) &&
            "No scratch register to align SP!");
-    scratchSPReg = AArch64::X9;
   }
 
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t.p.northover wrote:
> But X9 isn't callee-saved (AAPCS says it's temporary), so I don't think we need to worry about stack layouts: it's basically dead at this point.
> 
> Unless there's some assertion that *everything* is fixed by now?
Well, all tests pass.
Would you like me to switch to your variant?


http://reviews.llvm.org/D10826