76 lines · python
1# Test 64-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 6 bytes. Each decrement and branch occupies 420# bytes if BRCTG can be used, otherwise it occupies 10 bytes (AGHI + BRCL).21# This means that loop 5 contains 4 * 6 + 0xffd8 + 4 * 4 == 0x10000 bytes22# and is therefore (just) in range. Loop 6 is out of range.23#24# CHECK: brctg {{%r[0-9]+}}25# CHECK: brctg {{%r[0-9]+}}26# CHECK: brctg {{%r[0-9]+}}27# CHECK: brctg {{%r[0-9]+}}28# CHECK: brctg {{%r[0-9]+}}29# CHECK: aghi {{%r[0-9]+}}, -130# CHECK: jglh31# CHECK: aghi {{%r[0-9]+}}, -132# CHECK: jglh33# CHECK: aghi {{%r[0-9]+}}, -134# CHECK: jglh35 36from __future__ import print_function37 38branch_blocks = 839main_size = 0xFFD840 41print("define void @f1(i8 *%base, i64 *%counts) {")42print("entry:")43 44for i in range(branch_blocks - 1, -1, -1):45 print(" %%countptr%d = getelementptr i64, i64 *%%counts, i64 %d" % (i, i))46 print(" %%initcount%d = load i64 , i64 *%%countptr%d" % (i, i))47 print(" br label %%loop%d" % i)48 49 print("loop%d:" % i)50 block1 = "entry" if i == branch_blocks - 1 else "loop%d" % (i + 1)51 block2 = "loop0" if i == 0 else "after%d" % (i - 1)52 print(53 (54 " %%count%d = phi i64 [ %%initcount%d, %%%s ],"55 " [ %%nextcount%d, %%%s ]" % (i, i, block1, i, block2)56 )57 )58 59a, b = 1, 160for i in range(0, main_size, 6):61 a, b = b, a + b62 offset = 4096 + b % 50000063 value = a % 25664 print(" %%ptr%d = getelementptr i8, i8 *%%base, i64 %d" % (i, offset))65 print(" store volatile i8 %d, i8 *%%ptr%d" % (value, i))66 67for i in range(branch_blocks):68 print(" %%nextcount%d = add i64 %%count%d, -1" % (i, i))69 print(" %%test%d = icmp ne i64 %%nextcount%d, 0" % (i, i))70 print(" br i1 %%test%d, label %%loop%d, label %%after%d" % (i, i, i))71 print("")72 print("after%d:" % i)73 74print(" ret void")75print("}")76