new testcase distilled from 176.gcc

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8094 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/ExecutionEngine/2003-08-23-RegisterAllocatePhysReg.ll b/test/ExecutionEngine/2003-08-23-RegisterAllocatePhysReg.ll
new file mode 100644 (file)
index 0000000..fa7df62
--- /dev/null
+++ b/test/ExecutionEngine/2003-08-23-RegisterAllocatePhysReg.ll
@@ -0,0 +1,30 @@
+; This testcase exposes a bug in the local register allocator where it runs out
+; of registers (due to too many overlapping live ranges), but then attempts to
+; use the ESP register (which is not allocatable) to hold a value.
+
+int %main(uint %A) {
+       %Ap2 = alloca uint, uint %A   ; ESP gets used again...
+       %B = add uint %A, 1           ; Produce lots of overlapping live ranges
+       %C = add uint %A, 2
+       %D = add uint %A, 3
+       %E = add uint %A, 4
+       %F = add uint %A, 5
+       %G = add uint %A, 6
+       %H = add uint %A, 7
+       %I = add uint %A, 8
+       %J = add uint %A, 9
+       %K = add uint %A, 10
+
+       store uint %A, uint *%Ap2      ; Uses of all of the values
+       store uint %B, uint *%Ap2
+       store uint %C, uint *%Ap2
+       store uint %D, uint *%Ap2
+       store uint %E, uint *%Ap2
+       store uint %F, uint *%Ap2
+       store uint %G, uint *%Ap2
+       store uint %H, uint *%Ap2
+       store uint %I, uint *%Ap2
+       store uint %J, uint *%Ap2
+       store uint %K, uint *%Ap2
+       ret int 0
+}