111 lines · python
1# Test normal conditional branches 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# 0xffd8 bytes, from MVIY instructions14# conditional branch to main15# after0:16# ...17# conditional branch to main18# afterN:19#20# Each conditional branch sequence occupies 8 bytes if it uses a short branch21# and 10 if it uses a long one. The ones before "main:" have to take the branch22# length into account -- which is 4 bytes for short branches -- so the final23# (0x28 - 4) / 8 == 4 blocks can use short branches. The ones after "main:"24# do not, so the first 0x28 / 8 == 5 can use short branches. However,25# the conservative algorithm we use makes one branch unnecessarily long26# on each side.27#28# CHECK: c %r4, 0(%r3)29# CHECK: jge [[LABEL:\.L[^ ]*]]30# CHECK: c %r4, 4(%r3)31# CHECK: jge [[LABEL]]32# CHECK: c %r4, 8(%r3)33# CHECK: jge [[LABEL]]34# CHECK: c %r4, 12(%r3)35# CHECK: jge [[LABEL]]36# CHECK: c %r4, 16(%r3)37# CHECK: jge [[LABEL]]38# CHECK: c %r4, 20(%r3)39# CHECK: jge [[LABEL]]40# CHECK: c %r4, 24(%r3)41# CHECK: j{{g?}}e [[LABEL]]42# CHECK: c %r4, 28(%r3)43# CHECK: je [[LABEL]]44# CHECK: c %r4, 32(%r3)45# CHECK: je [[LABEL]]46# CHECK: c %r4, 36(%r3)47# CHECK: je [[LABEL]]48# ...main goes here...49# CHECK: c %r4, 100(%r3)50# CHECK: je [[LABEL:\.L[^ ]*]]51# CHECK: c %r4, 104(%r3)52# CHECK: je [[LABEL]]53# CHECK: c %r4, 108(%r3)54# CHECK: je [[LABEL]]55# CHECK: c %r4, 112(%r3)56# CHECK: je [[LABEL]]57# CHECK: c %r4, 116(%r3)58# CHECK: j{{g?}}e [[LABEL]]59# CHECK: c %r4, 120(%r3)60# CHECK: jge [[LABEL]]61# CHECK: c %r4, 124(%r3)62# CHECK: jge [[LABEL]]63# CHECK: c %r4, 128(%r3)64# CHECK: jge [[LABEL]]65# CHECK: c %r4, 132(%r3)66# CHECK: jge [[LABEL]]67# CHECK: c %r4, 136(%r3)68# CHECK: jge [[LABEL]]69 70from __future__ import print_function71 72branch_blocks = 1073main_size = 0xFFD874 75print("@global = global i32 0")76 77print("define void @f1(i8 *%base, i32 *%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 i32, i32 *%%stop, i64 %d" % (i, i))86 print(" %%bcur%d = load i32 , i32 *%%bstop%d" % (i, i))87 print(" %%btest%d = icmp eq i32 %%limit, %%bcur%d" % (i, i))88 print(" br i1 %%btest%d, label %%after0, label %%%s" % (i, next))89 print("")90 91print("%s:" % next)92a, b = 1, 193for i in range(0, main_size, 6):94 a, b = b, a + b95 offset = 4096 + b % 50000096 value = a % 25697 print(" %%ptr%d = getelementptr i8, i8 *%%base, i64 %d" % (i, offset))98 print(" store volatile i8 %d, i8 *%%ptr%d" % (value, i))99 100for i in range(branch_blocks):101 print(" %%astop%d = getelementptr i32, i32 *%%stop, i64 %d" % (i, i + 25))102 print(" %%acur%d = load i32 , i32 *%%astop%d" % (i, i))103 print(" %%atest%d = icmp eq i32 %%limit, %%acur%d" % (i, i))104 print(" br i1 %%atest%d, label %%main, label %%after%d" % (i, i))105 print("")106 print("after%d:" % i)107 108print(" %dummy = load volatile i32, i32 *@global")109print(" ret void")110print("}")111