| # Test 64-bit COMPARE LOGICAL IMMEDIATE AND BRANCH in cases where the sheer | |
| # number of instructions causes some branches to be out of range. | |
| # RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s | |
| # Construct: | |
| # | |
| # before0: | |
| # conditional branch to after0 | |
| # ... | |
| # beforeN: | |
| # conditional branch to after0 | |
| # main: | |
| # 0xffb4 bytes, from MVIY instructions | |
| # conditional branch to main | |
| # after0: | |
| # ... | |
| # conditional branch to main | |
| # afterN: | |
| # | |
| # Each conditional branch sequence occupies 18 bytes if it uses a short | |
| # branch and 24 if it uses a long one. The ones before "main:" have to | |
| # take the branch length into account, which is 6 for short branches, | |
| # so the final (0x4c - 6) / 18 == 3 blocks can use short branches. | |
| # The ones after "main:" do not, so the first 0x4c / 18 == 4 blocks | |
| # can use short branches. The conservative algorithm we use makes | |
| # one of the forward branches unnecessarily long, as noted in the | |
| # check output below. | |
| # | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgfi [[REG]], 50 | |
| # CHECK: jgl [[LABEL:\.L[^ ]*]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgfi [[REG]], 51 | |
| # CHECK: jgl [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgfi [[REG]], 52 | |
| # CHECK: jgl [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgfi [[REG]], 53 | |
| # CHECK: jgl [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgfi [[REG]], 54 | |
| # CHECK: jgl [[LABEL]] | |
| # ...as mentioned above, the next one could be a CLGIJL instead... | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgfi [[REG]], 55 | |
| # CHECK: jgl [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgijl [[REG]], 56, [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgijl [[REG]], 57, [[LABEL]] | |
| # ...main goes here... | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgijl [[REG]], 100, [[LABEL:\.L[^ ]*]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgijl [[REG]], 101, [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgijl [[REG]], 102, [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgijl [[REG]], 103, [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgfi [[REG]], 104 | |
| # CHECK: jgl [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgfi [[REG]], 105 | |
| # CHECK: jgl [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgfi [[REG]], 106 | |
| # CHECK: jgl [[LABEL]] | |
| # CHECK: lg [[REG:%r[0-5]]], 0(%r3) | |
| # CHECK: sg [[REG]], 0(%r4) | |
| # CHECK: clgfi [[REG]], 107 | |
| # CHECK: jgl [[LABEL]] | |
| branch_blocks = 8 | |
| main_size = 0xffb4 | |
| print '@global = global i32 0' | |
| print 'define void @f1(i8 *%base, i64 *%stopa, i64 *%stopb) {' | |
| print 'entry:' | |
| print ' br label %before0' | |
| print '' | |
| for i in xrange(branch_blocks): | |
| next = 'before%d' % (i + 1) if i + 1 < branch_blocks else 'main' | |
| print 'before%d:' % i | |
| print ' %%bcur%da = load i64 , i64 *%%stopa' % i | |
| print ' %%bcur%db = load i64 , i64 *%%stopb' % i | |
| print ' %%bsub%d = sub i64 %%bcur%da, %%bcur%db' % (i, i, i) | |
| print ' %%btest%d = icmp ult i64 %%bsub%d, %d' % (i, i, i + 50) | |
| print ' br i1 %%btest%d, label %%after0, label %%%s' % (i, next) | |
| print '' | |
| print '%s:' % next | |
| a, b = 1, 1 | |
| for i in xrange(0, main_size, 6): | |
| a, b = b, a + b | |
| offset = 4096 + b % 500000 | |
| value = a % 256 | |
| print ' %%ptr%d = getelementptr i8, i8 *%%base, i64 %d' % (i, offset) | |
| print ' store volatile i8 %d, i8 *%%ptr%d' % (value, i) | |
| for i in xrange(branch_blocks): | |
| print ' %%acur%da = load i64 , i64 *%%stopa' % i | |
| print ' %%acur%db = load i64 , i64 *%%stopb' % i | |
| print ' %%asub%d = sub i64 %%acur%da, %%acur%db' % (i, i, i) | |
| print ' %%atest%d = icmp ult i64 %%asub%d, %d' % (i, i, i + 100) | |
| print ' br i1 %%atest%d, label %%main, label %%after%d' % (i, i) | |
| print '' | |
| print 'after%d:' % i | |
| print ' %dummy = load volatile i32, i32 *@global' | |
| print ' ret void' | |
| print '}' |