1# Test 32-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 4 bytes. Each decrement and branch occupies 4 20# 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 bytes 22# 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]+}}, -1 31# CHECK: jglh 32# CHECK: ahi {{%r[0-9]+}}, -1 33# CHECK: jglh 34 35from __future__ import print_function 36 37branch_blocks = 8 38main_size = 0xFFD8 39 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, 1 59for i in range(0, main_size, 6): 60 a, b = b, a + b 61 offset = 4096 + b % 500000 62 value = a % 256 63 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