| # Test 64-bit BRANCH RELATIVE ON COUNT in cases where some branches are out |
| # of range. |
| # RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s |
| |
| # Construct: |
| # |
| # loopN: |
| # load of countN |
| # ... |
| # loop0: |
| # 0xffd8 bytes, from MVIY instructions |
| # conditional branch to main |
| # after0: |
| # ... |
| # decrement of countN |
| # conditional branch to loopN |
| # afterN: |
| # |
| # Each load occupies 6 bytes. Each decrement and branch occupies 4 |
| # bytes if BRCTG can be used, otherwise it occupies 10 bytes (AGHI + BRCL). |
| # This means that loop 5 contains 4 * 6 + 0xffd8 + 4 * 4 == 0x10000 bytes |
| # and is therefore (just) in range. Loop 6 is out of range. |
| # |
| # CHECK: brctg {{%r[0-9]+}} |
| # CHECK: brctg {{%r[0-9]+}} |
| # CHECK: brctg {{%r[0-9]+}} |
| # CHECK: brctg {{%r[0-9]+}} |
| # CHECK: brctg {{%r[0-9]+}} |
| # CHECK: aghi {{%r[0-9]+}}, -1 |
| # CHECK: jglh |
| # CHECK: aghi {{%r[0-9]+}}, -1 |
| # CHECK: jglh |
| # CHECK: aghi {{%r[0-9]+}}, -1 |
| # CHECK: jglh |
| |
| branch_blocks = 8 |
| main_size = 0xffd8 |
| |
| print 'define void @f1(i8 *%base, i64 *%counts) {' |
| print 'entry:' |
| |
| for i in xrange(branch_blocks - 1, -1, -1): |
| print ' %%countptr%d = getelementptr i64, i64 *%%counts, i64 %d' % (i, i) |
| print ' %%initcount%d = load i64 , i64 *%%countptr%d' % (i, i) |
| print ' br label %%loop%d' % i |
| |
| print 'loop%d:' % i |
| block1 = 'entry' if i == branch_blocks - 1 else 'loop%d' % (i + 1) |
| block2 = 'loop0' if i == 0 else 'after%d' % (i - 1) |
| print (' %%count%d = phi i64 [ %%initcount%d, %%%s ],' |
| ' [ %%nextcount%d, %%%s ]' % (i, i, block1, i, block2)) |
| |
| 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 ' %%nextcount%d = add i64 %%count%d, -1' % (i, i) |
| print ' %%test%d = icmp ne i64 %%nextcount%d, 0' % (i, i) |
| print ' br i1 %%test%d, label %%loop%d, label %%after%d' % (i, i, i) |
| print '' |
| print 'after%d:' % i |
| |
| print ' ret void' |
| print '}' |