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 35 branch_blocks = 8 36 main_size = 0xffd8 37 38 print 'define void @f1(i8 *%base, i32 *%counts) {' 39 print 'entry:' 40 41 for i in xrange(branch_blocks - 1, -1, -1): 42 print ' %%countptr%d = getelementptr i32, i32 *%%counts, i64 %d' % (i, i) 43 print ' %%initcount%d = load i32 , i32 *%%countptr%d' % (i, i) 44 print ' br label %%loop%d' % i 45 46 print 'loop%d:' % i 47 block1 = 'entry' if i == branch_blocks - 1 else 'loop%d' % (i + 1) 48 block2 = 'loop0' if i == 0 else 'after%d' % (i - 1) 49 print (' %%count%d = phi i32 [ %%initcount%d, %%%s ],' 50 ' [ %%nextcount%d, %%%s ]' % (i, i, block1, i, block2)) 51 52 a, b = 1, 1 53 for i in xrange(0, main_size, 6): 54 a, b = b, a + b 55 offset = 4096 + b % 500000 56 value = a % 256 57 print ' %%ptr%d = getelementptr i8, i8 *%%base, i64 %d' % (i, offset) 58 print ' store volatile i8 %d, i8 *%%ptr%d' % (value, i) 59 60 for i in xrange(branch_blocks): 61 print ' %%nextcount%d = add i32 %%count%d, -1' % (i, i) 62 print ' %%test%d = icmp ne i32 %%nextcount%d, 0' % (i, i) 63 print ' br i1 %%test%d, label %%loop%d, label %%after%d' % (i, i, i) 64 print '' 65 print 'after%d:' % i 66 67 print ' ret void' 68 print '}' 69
