# Test 32-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 4 bytes. Each decrement and branch occupies 4 # bytes if BRCT can be used, otherwise it occupies 10 bytes (AHI + BRCL). # This means that loop 6 contains 5 * 4 + 0xffd8 + 5 * 4 == 0x10000 bytes # and is therefore (just) in range. Loop 7 is out of range. # # CHECK: brct {{%r[0-9]+}} # CHECK: brct {{%r[0-9]+}} # CHECK: brct {{%r[0-9]+}} # CHECK: brct {{%r[0-9]+}} # CHECK: brct {{%r[0-9]+}} # CHECK: brct {{%r[0-9]+}} # CHECK: ahi {{%r[0-9]+}}, -1 # CHECK: jglh # CHECK: ahi {{%r[0-9]+}}, -1 # CHECK: jglh from __future__ import print_function branch_blocks = 8 main_size = 0xFFD8 print("define void @f1(i8 *%base, i32 *%counts) {") print("entry:") for i in range(branch_blocks - 1, -1, -1): print(" %%countptr%d = getelementptr i32, i32 *%%counts, i64 %d" % (i, i)) print(" %%initcount%d = load i32 , i32 *%%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 i32 [ %%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 i32 %%count%d, -1" % (i, i)) print(" %%test%d = icmp ne i32 %%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("}")