75 lines · python
1# Test 32-bit BRANCH RELATIVE ON COUNT in cases where some branches are out2# of range.3# RUN: %python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s4 5# Construct:6#7# loopN:8# load of countN9# ...10# loop0:11# 0xffd8 bytes, from MVIY instructions12# conditional branch to main13# after0:14# ...15# decrement of countN16# conditional branch to loopN17# afterN:18#19# Each load occupies 4 bytes. Each decrement and branch occupies 420# bytes if BRCT can be used, otherwise it occupies 10 bytes (AHI + BRCL).21# This means that loop 6 contains 5 * 4 + 0xffd8 + 5 * 4 == 0x10000 bytes22# and is therefore (just) in range. Loop 7 is out of range.23#24# CHECK: brct {{%r[0-9]+}}25# CHECK: brct {{%r[0-9]+}}26# CHECK: brct {{%r[0-9]+}}27# CHECK: brct {{%r[0-9]+}}28# CHECK: brct {{%r[0-9]+}}29# CHECK: brct {{%r[0-9]+}}30# CHECK: ahi {{%r[0-9]+}}, -131# CHECK: jglh32# CHECK: ahi {{%r[0-9]+}}, -133# CHECK: jglh34 35from __future__ import print_function36 37branch_blocks = 838main_size = 0xFFD839 40print("define void @f1(i8 *%base, i32 *%counts) {")41print("entry:")42 43for i in range(branch_blocks - 1, -1, -1):44 print(" %%countptr%d = getelementptr i32, i32 *%%counts, i64 %d" % (i, i))45 print(" %%initcount%d = load i32 , i32 *%%countptr%d" % (i, i))46 print(" br label %%loop%d" % i)47 48 print("loop%d:" % i)49 block1 = "entry" if i == branch_blocks - 1 else "loop%d" % (i + 1)50 block2 = "loop0" if i == 0 else "after%d" % (i - 1)51 print(52 (53 " %%count%d = phi i32 [ %%initcount%d, %%%s ],"54 " [ %%nextcount%d, %%%s ]" % (i, i, block1, i, block2)55 )56 )57 58a, b = 1, 159for i in range(0, main_size, 6):60 a, b = b, a + b61 offset = 4096 + b % 50000062 value = a % 25663 print(" %%ptr%d = getelementptr i8, i8 *%%base, i64 %d" % (i, offset))64 print(" store volatile i8 %d, i8 *%%ptr%d" % (value, i))65 66for i in range(branch_blocks):67 print(" %%nextcount%d = add i32 %%count%d, -1" % (i, i))68 print(" %%test%d = icmp ne i32 %%nextcount%d, 0" % (i, i))69 print(" br i1 %%test%d, label %%loop%d, label %%after%d" % (i, i, i))70 print("")71 print("after%d:" % i)72 73print(" ret void")74print("}")75