# Test cases where we spill from one frame index to another, both of which # are out of range of MVC, and both of which need emergency spill slots. # RUN: %python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s # CHECK: f1: # CHECK: %fallthru # CHECK-DAG: stg [[REG1:%r[0-9]+]], 8168(%r15) # CHECK-DAG: stg [[REG2:%r[0-9]+]], 8176(%r15) # CHECK-DAG: lay [[REG3:%r[0-9]+]], 8192(%r15) # CHECK-DAG: lay [[REG4:%r[0-9]+]], 4096(%r15) # CHECK: mvc 0(8,[[REG3]]), 4088([[REG4]]) # CHECK-DAG: lg [[REG1]], 8168(%r15) # CHECK-DAG: lg [[REG2]], 8176(%r15) # CHECK: %skip # CHECK: br %r14 # Arrange for %foo's spill slot to be at 8184(%r15) and the alloca area to be at # 8192(%r15). The two emergency spill slots live below that, so this requires # the first 8168 bytes to be used for the call. 160 of these bytes are # allocated for the ABI frame. There are also 5 argument registers, one of # which is used as a base pointer. from __future__ import print_function args = int((8168 - 160) / 8 + (5 - 1)) print("declare i64 *@foo(i64 *%s)" % (", i64" * args)) print("declare void @bar(i64 *)") print("") print("define i64 @f1(i64 %foo) {") print("entry:") # Make the allocation big, so that it goes at the top of the frame. print(" %array = alloca [1000 x i64]") print(" %area = getelementptr [1000 x i64], [1000 x i64] *%array, i64 0, i64 0") print(" %%base = call i64 *@foo(i64 *%%area%s)" % (", i64 0" * args)) print("") # Make sure all GPRs are used. One is needed for the stack pointer and # another for %base, so we need 14 live values. count = 14 for i in range(count): print(" %%ptr%d = getelementptr i64, i64 *%%base, i64 %d" % (i, i / 2)) print(" %%val%d = load volatile i64 , i64 *%%ptr%d" % (i, i)) print("") # Encourage the register allocator to give preference to these %vals # by using them several times. for j in range(4): for i in range(count): print(" store volatile i64 %%val%d, i64 *%%ptr%d" % (i, i)) print("") # Copy the incoming argument, which we expect to be spilled, to the frame # index for the alloca area. Also throw in a volatile store, so that this # block cannot be reordered with the surrounding code. print(" %cond = icmp eq i64 %val0, %val1") print(" br i1 %cond, label %skip, label %fallthru") print("") print("fallthru:") print(" store i64 %foo, i64 *%area") print(" store volatile i64 %val0, i64 *%ptr0") print(" br label %skip") print("") print("skip:") # Use each %val a few more times to emphasise the point, and to make sure # that they are live across the store of %foo. for j in range(4): for i in range(count): print(" store volatile i64 %%val%d, i64 *%%ptr%d" % (i, i)) print("") print(" call void @bar(i64 *%area)") print(" ret i64 0") print("}")