1 # Test cases where we spill from one frame index to another, both of which
2 # are out of range of MVC, and both of which need emergency spill slots.
3 # RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s
7 # CHECK-DAG: stg [[REG1:%r[0-9]+]], 8168(%r15)
8 # CHECK-DAG: stg [[REG2:%r[0-9]+]], 8176(%r15)
9 # CHECK-DAG: lay [[REG3:%r[0-9]+]], 8192(%r15)
10 # CHECK-DAG: lay [[REG4:%r[0-9]+]], 4096(%r15)
11 # CHECK: mvc 0(8,[[REG3]]), 4088([[REG4]])
12 # CHECK-DAG: lg [[REG1]], 8168(%r15)
13 # CHECK-DAG: lg [[REG2]], 8176(%r15)
17 # Arrange for %foo's spill slot to be at 8184(%r15) and the alloca area to be at
18 # 8192(%r15). The two emergency spill slots live below that, so this requires
19 # the first 8168 bytes to be used for the call. 160 of these bytes are
20 # allocated for the ABI frame. There are also 5 argument registers, one of
21 # which is used as a base pointer.
22 args = (8168 - 160) / 8 + (5 - 1)
24 print 'declare i64 *@foo(i64 *%s)' % (', i64' * args)
25 print 'declare void @bar(i64 *)'
27 print 'define i64 @f1(i64 %foo) {'
30 # Make the allocation big, so that it goes at the top of the frame.
31 print ' %array = alloca [1000 x i64]'
32 print ' %area = getelementptr [1000 x i64], [1000 x i64] *%array, i64 0, i64 0'
33 print ' %%base = call i64 *@foo(i64 *%%area%s)' % (', i64 0' * args)
36 # Make sure all GPRs are used. One is needed for the stack pointer and
37 # another for %base, so we need 14 live values.
39 for i in range(count):
40 print ' %%ptr%d = getelementptr i64, i64 *%%base, i64 %d' % (i, i / 2)
41 print ' %%val%d = load volatile i64 , i64 *%%ptr%d' % (i, i)
44 # Encourage the register allocator to give preference to these %vals
45 # by using them several times.
47 for i in range(count):
48 print ' store volatile i64 %%val%d, i64 *%%ptr%d' % (i, i)
51 # Copy the incoming argument, which we expect to be spilled, to the frame
52 # index for the alloca area. Also throw in a volatile store, so that this
53 # block cannot be reordered with the surrounding code.
54 print ' %cond = icmp eq i64 %val0, %val1'
55 print ' br i1 %cond, label %skip, label %fallthru'
58 print ' store i64 %foo, i64 *%area'
59 print ' store volatile i64 %val0, i64 *%ptr0'
60 print ' br label %skip'
64 # Use each %val a few more times to emphasise the point, and to make sure
65 # that they are live across the store of %foo.
67 for i in range(count):
68 print ' store volatile i64 %%val%d, i64 *%%ptr%d' % (i, i)
71 print ' call void @bar(i64 *%area)'