1# Test 32-bit COMPARE AND BRANCH in cases where the sheer number of 2# instructions causes some branches to be out of range. 3# RUN: %python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s 4 5# Construct: 6# 7# before0: 8# conditional branch to after0 9# ... 10# beforeN: 11# conditional branch to after0 12# main: 13# 0xffcc bytes, from MVIY instructions 14# conditional branch to main 15# after0: 16# ... 17# conditional branch to main 18# afterN: 19# 20# Each conditional branch sequence occupies 12 bytes if it uses a short 21# branch and 14 if it uses a long one. The ones before "main:" have to 22# 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 blocks 25# can use short branches. 26# 27# CHECK: lb [[REG:%r[0-5]]], 0(%r3) 28# CHECK: cr %r4, [[REG]] 29# CHECK: jge [[LABEL:\.L[^ ]*]] 30# CHECK: lb [[REG:%r[0-5]]], 1(%r3) 31# CHECK: cr %r4, [[REG]] 32# CHECK: jge [[LABEL]] 33# CHECK: lb [[REG:%r[0-5]]], 2(%r3) 34# CHECK: cr %r4, [[REG]] 35# CHECK: jge [[LABEL]] 36# CHECK: lb [[REG:%r[0-5]]], 3(%r3) 37# CHECK: cr %r4, [[REG]] 38# CHECK: jge [[LABEL]] 39# CHECK: lb [[REG:%r[0-5]]], 4(%r3) 40# CHECK: cr %r4, [[REG]] 41# CHECK: jge [[LABEL]] 42# CHECK: lb [[REG:%r[0-5]]], 5(%r3) 43# CHECK: crje %r4, [[REG]], [[LABEL]] 44# CHECK: lb [[REG:%r[0-5]]], 6(%r3) 45# CHECK: crje %r4, [[REG]], [[LABEL]] 46# CHECK: lb [[REG:%r[0-5]]], 7(%r3) 47# CHECK: crje %r4, [[REG]], [[LABEL]] 48# ...main goes here... 49# CHECK: lb [[REG:%r[0-5]]], 25(%r3) 50# CHECK: crje %r4, [[REG]], [[LABEL:\.L[^ ]*]] 51# CHECK: lb [[REG:%r[0-5]]], 26(%r3) 52# CHECK: crje %r4, [[REG]], [[LABEL]] 53# CHECK: lb [[REG:%r[0-5]]], 27(%r3) 54# CHECK: crje %r4, [[REG]], [[LABEL]] 55# CHECK: lb [[REG:%r[0-5]]], 28(%r3) 56# CHECK: crje %r4, [[REG]], [[LABEL]] 57# CHECK: lb [[REG:%r[0-5]]], 29(%r3) 58# CHECK: cr %r4, [[REG]] 59# CHECK: jge [[LABEL]] 60# CHECK: lb [[REG:%r[0-5]]], 30(%r3) 61# CHECK: cr %r4, [[REG]] 62# CHECK: jge [[LABEL]] 63# CHECK: lb [[REG:%r[0-5]]], 31(%r3) 64# CHECK: cr %r4, [[REG]] 65# CHECK: jge [[LABEL]] 66# CHECK: lb [[REG:%r[0-5]]], 32(%r3) 67# CHECK: cr %r4, [[REG]] 68# CHECK: jge [[LABEL]] 69 70from __future__ import print_function 71 72branch_blocks = 8 73main_size = 0xFFCC 74 75print("@global = global i32 0") 76 77print("define void @f1(i8 *%base, i8 *%stop, i32 %limit) {") 78print("entry:") 79print(" br label %before0") 80print("") 81 82for i in range(branch_blocks): 83 next = "before%d" % (i + 1) if i + 1 < branch_blocks else "main" 84 print("before%d:" % i) 85 print(" %%bstop%d = getelementptr i8, i8 *%%stop, i64 %d" % (i, i)) 86 print(" %%bcur%d = load i8 , i8 *%%bstop%d" % (i, i)) 87 print(" %%bext%d = sext i8 %%bcur%d to i32" % (i, i)) 88 print(" %%btest%d = icmp eq i32 %%limit, %%bext%d" % (i, i)) 89 print(" br i1 %%btest%d, label %%after0, label %%%s" % (i, next)) 90 print("") 91 92print("%s:" % next) 93a, b = 1, 1 94for i in range(0, main_size, 6): 95 a, b = b, a + b 96 offset = 4096 + b % 500000 97 value = a % 256 98 print(" %%ptr%d = getelementptr i8, i8 *%%base, i64 %d" % (i, offset)) 99 print(" store volatile i8 %d, i8 *%%ptr%d" % (value, i)) 100 101for i in range(branch_blocks): 102 print(" %%astop%d = getelementptr i8, i8 *%%stop, i64 %d" % (i, i + 25)) 103 print(" %%acur%d = load i8 , i8 *%%astop%d" % (i, i)) 104 print(" %%aext%d = sext i8 %%acur%d to i32" % (i, i)) 105 print(" %%atest%d = icmp eq i32 %%limit, %%aext%d" % (i, i)) 106 print(" br i1 %%atest%d, label %%main, label %%after%d" % (i, i)) 107 print("") 108 print("after%d:" % i) 109 110print(" %dummy = load volatile i32, i32 *@global") 111print(" ret void") 112print("}") 113