1# Test 64-bit BRANCH RELATIVE ON COUNT in cases where some branches are out 2# of range. 3# RUN: %python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s 4 5# Construct: 6# 7# loopN: 8# load of countN 9# ... 10# loop0: 11# 0xffd8 bytes, from MVIY instructions 12# conditional branch to main 13# after0: 14# ... 15# decrement of countN 16# conditional branch to loopN 17# afterN: 18# 19# Each load occupies 6 bytes. Each decrement and branch occupies 4 20# 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 bytes 22# 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]+}}, -1 30# CHECK: jglh 31# CHECK: aghi {{%r[0-9]+}}, -1 32# CHECK: jglh 33# CHECK: aghi {{%r[0-9]+}}, -1 34# CHECK: jglh 35 36from __future__ import print_function 37 38branch_blocks = 8 39main_size = 0xFFD8 40 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, 1 60for i in range(0, main_size, 6): 61 a, b = b, a + b 62 offset = 4096 + b % 500000 63 value = a % 256 64 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