| # 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 |
| |
| from __future__ import print_function |
| |
| branch_blocks = 8 |
| main_size = 0xFFD8 |
| |
| print("define void @f1(i8 *%base, i64 *%counts) {") |
| print("entry:") |
| |
| for i in range(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 range(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 range(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("}") |