riscv: update 'failed to perform tail call elimination' example

It is kind of trivial now, because musttail is accepted for more
signatures

Author: folkertdev

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -23900,7 +23900,7 @@ SDValue RISCVTargetLowering::LowerCall(CallLoweringInfo &CLI,
         StackPtr = DAG.getCopyFromReg(Chain, DL, RISCV::X2, PtrVT);
 
       if (IsTailCall) {
-        unsigned OpSize = (VA.getValVT().getSizeInBits() + 7) / 8;
+        unsigned OpSize = divideCeil(VA.getValVT().getSizeInBits(), 8);
         int FI = MF.getFrameInfo().CreateFixedObject(OpSize, Offset, true);
         DstAddr = DAG.getFrameIndex(FI, PtrVT);
         DstInfo = MachinePointerInfo::getFixedStack(MF, FI);

llvm/test/CodeGen/RISCV/musttail-call.ll

@@ -9,12 +9,13 @@
 ; RUN: not --crash llc -mtriple riscv64-unknown-elf -o - %s \
 ; RUN: 2>&1 | FileCheck %s
 
-%struct.A = type { i32 }
+declare void @callee_musttail()
 
-declare void @callee_musttail(ptr sret(%struct.A) %a)
-define void @caller_musttail(ptr sret(%struct.A) %a) {
+define void @caller_musttail() #0 {
 ; CHECK: LLVM ERROR: failed to perform tail call elimination on a call site marked musttail
 entry:
-  musttail call void @callee_musttail(ptr sret(%struct.A) %a)
+  musttail call void @callee_musttail()
   ret void
 }
+
+attributes #0 = { "interrupt"="machine" }