[llvm] [RISCV] Add stack clash vector support (PR #119458)

[Craig Topper via llvm-commits]

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@@ -870,11 +918,15 @@ void RISCVFrameLowering::emitPrologue(MachineFunction &MF,
   }
 
   if (RVVStackSize) {
-    // We must keep the stack pointer aligned through any intermediate
-    // updates.
-    RI->adjustReg(MBB, MBBI, DL, SPReg, SPReg,
-                  StackOffset::getScalable(-RVVStackSize),
-                  MachineInstr::FrameSetup, getStackAlign());
+    if (NeedProbe)
+      allocateAndProbeStackForRVV(MF, MBB, MBBI, DL, RVVStackSize,
+                                  MachineInstr::FrameSetup, !hasFP(MF));
+    else
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topperc wrote:

Add curly braces around this since the comment makes it multiple lines for the reader. See https://llvm.org/docs/CodingStandards.html#don-t-use-braces-on-simple-single-statement-bodies-of-if-else-loop-statements

You'll also need to add curly braces around if body for consistency.

https://github.com/llvm/llvm-project/pull/119458