115 lines · python
1# Test 64-bit COMPARE IMMEDIATE AND BRANCH in cases where the sheer number of2# instructions causes some branches to be out of range.3# RUN: %python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s4 5# Construct:6#7# before0:8# conditional branch to after09# ...10# beforeN:11# conditional branch to after012# main:13# 0xffcc bytes, from MVIY instructions14# conditional branch to main15# after0:16# ...17# conditional branch to main18# afterN:19#20# Each conditional branch sequence occupies 12 bytes if it uses a short21# branch and 16 if it uses a long one. The ones before "main:" have to22# take the branch length into account, which is 6 for short branches,23# so the final (0x34 - 6) / 12 == 3 blocks can use short branches.24# The ones after "main:" do not, so the first 0x34 / 12 == 4 blocks25# can use short branches. The conservative algorithm we use makes26# one of the forward branches unnecessarily long, as noted in the27# check output below.28#29# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)30# CHECK: cghi [[REG]], 5031# CHECK: jgl [[LABEL:\.L[^ ]*]]32# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)33# CHECK: cghi [[REG]], 5134# CHECK: jgl [[LABEL]]35# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)36# CHECK: cghi [[REG]], 5237# CHECK: jgl [[LABEL]]38# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)39# CHECK: cghi [[REG]], 5340# CHECK: jgl [[LABEL]]41# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)42# CHECK: cghi [[REG]], 5443# CHECK: jgl [[LABEL]]44# ...as mentioned above, the next one could be a CGIJL instead...45# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)46# CHECK: cghi [[REG]], 5547# CHECK: jgl [[LABEL]]48# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)49# CHECK: cgijl [[REG]], 56, [[LABEL]]50# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)51# CHECK: cgijl [[REG]], 57, [[LABEL]]52# ...main goes here...53# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)54# CHECK: cgijl [[REG]], 100, [[LABEL:\.L[^ ]*]]55# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)56# CHECK: cgijl [[REG]], 101, [[LABEL]]57# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)58# CHECK: cgijl [[REG]], 102, [[LABEL]]59# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)60# CHECK: cgijl [[REG]], 103, [[LABEL]]61# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)62# CHECK: cghi [[REG]], 10463# CHECK: jgl [[LABEL]]64# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)65# CHECK: cghi [[REG]], 10566# CHECK: jgl [[LABEL]]67# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)68# CHECK: cghi [[REG]], 10669# CHECK: jgl [[LABEL]]70# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)71# CHECK: cghi [[REG]], 10772# CHECK: jgl [[LABEL]]73 74from __future__ import print_function75 76branch_blocks = 877main_size = 0xFFCC78 79print("@global = global i32 0")80 81print("define void @f1(i8 *%base, i8 *%stop) {")82print("entry:")83print(" br label %before0")84print("")85 86for i in range(branch_blocks):87 next = "before%d" % (i + 1) if i + 1 < branch_blocks else "main"88 print("before%d:" % i)89 print(" %%bcur%d = load i8 , i8 *%%stop" % i)90 print(" %%bext%d = sext i8 %%bcur%d to i64" % (i, i))91 print(" %%btest%d = icmp slt i64 %%bext%d, %d" % (i, i, i + 50))92 print(" br i1 %%btest%d, label %%after0, label %%%s" % (i, next))93 print("")94 95print("%s:" % next)96a, b = 1, 197for i in range(0, main_size, 6):98 a, b = b, a + b99 offset = 4096 + b % 500000100 value = a % 256101 print(" %%ptr%d = getelementptr i8, i8 *%%base, i64 %d" % (i, offset))102 print(" store volatile i8 %d, i8 *%%ptr%d" % (value, i))103 104for i in range(branch_blocks):105 print(" %%acur%d = load i8 , i8 *%%stop" % i)106 print(" %%aext%d = sext i8 %%acur%d to i64" % (i, i))107 print(" %%atest%d = icmp slt i64 %%aext%d, %d" % (i, i, i + 100))108 print(" br i1 %%atest%d, label %%main, label %%after%d" % (i, i))109 print("")110 print("after%d:" % i)111 112print(" %dummy = load volatile i32, i32 *@global")113print(" ret void")114print("}")115