77 lines · python
1# Test cases where we spill from one frame index to another, both of which2# are out of range of MVC, and both of which need emergency spill slots.3# RUN: %python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s4 5# CHECK: f1:6# CHECK: %fallthru7# 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)14# CHECK: %skip15# CHECK: br %r1416 17# Arrange for %foo's spill slot to be at 8184(%r15) and the alloca area to be at18# 8192(%r15). The two emergency spill slots live below that, so this requires19# the first 8168 bytes to be used for the call. 160 of these bytes are20# allocated for the ABI frame. There are also 5 argument registers, one of21# which is used as a base pointer.22 23from __future__ import print_function24 25args = int((8168 - 160) / 8 + (5 - 1))26 27print("declare i64 *@foo(i64 *%s)" % (", i64" * args))28print("declare void @bar(i64 *)")29print("")30print("define i64 @f1(i64 %foo) {")31print("entry:")32 33# Make the allocation big, so that it goes at the top of the frame.34print(" %array = alloca [1000 x i64]")35print(" %area = getelementptr [1000 x i64], [1000 x i64] *%array, i64 0, i64 0")36print(" %%base = call i64 *@foo(i64 *%%area%s)" % (", i64 0" * args))37print("")38 39# Make sure all GPRs are used. One is needed for the stack pointer and40# another for %base, so we need 14 live values.41count = 1442for i in range(count):43 print(" %%ptr%d = getelementptr i64, i64 *%%base, i64 %d" % (i, i / 2))44 print(" %%val%d = load volatile i64 , i64 *%%ptr%d" % (i, i))45 print("")46 47# Encourage the register allocator to give preference to these %vals48# by using them several times.49for j in range(4):50 for i in range(count):51 print(" store volatile i64 %%val%d, i64 *%%ptr%d" % (i, i))52 print("")53 54# Copy the incoming argument, which we expect to be spilled, to the frame55# index for the alloca area. Also throw in a volatile store, so that this56# block cannot be reordered with the surrounding code.57print(" %cond = icmp eq i64 %val0, %val1")58print(" br i1 %cond, label %skip, label %fallthru")59print("")60print("fallthru:")61print(" store i64 %foo, i64 *%area")62print(" store volatile i64 %val0, i64 *%ptr0")63print(" br label %skip")64print("")65print("skip:")66 67# Use each %val a few more times to emphasise the point, and to make sure68# that they are live across the store of %foo.69for j in range(4):70 for i in range(count):71 print(" store volatile i64 %%val%d, i64 *%%ptr%d" % (i, i))72 print("")73 74print(" call void @bar(i64 *%area)")75print(" ret i64 0")76print("}")77