From Kalle Raiskila:

"the bigstack patch for SPU, with testcase. It is essentially the patch committed as 97091, and reverted as 97099, but with the following additions:
-in vararg handling, registers are marked to be live, to not confuse the register scavenger
-function prologue and epilogue are not emitted, if the stack size is 16. 16 means it is empty - there is only the register scavenger emergency spill slot, which is not used as there is no stack."



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99819 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/CellSPU/bigstack.ll

@@ -0,0 +1,17 @@
+; RUN: llc < %s -march=cellspu -o %t1.s
+; RUN: grep lqx   %t1.s | count 4
+; RUN: grep il    %t1.s | grep -v file | count 7
+; RUN: grep stqx  %t1.s | count 2
+
+define i32 @bigstack() nounwind {
+entry:
+  %avar = alloca i32                            
+  %big_data = alloca [2048 x i32]                
+  store i32 3840, i32* %avar, align 4
+  br label %return
+
+return:                                          
+  %retval = load i32* %avar                
+  ret i32 %retval
+}
+