76 lines
2.1 KiB
Python
76 lines
2.1 KiB
Python
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# Test 64-bit BRANCH RELATIVE ON COUNT in cases where some branches are out
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# of range.
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# RUN: %python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s
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# Construct:
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#
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# loopN:
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# load of countN
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# ...
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# loop0:
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# 0xffd8 bytes, from MVIY instructions
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# conditional branch to main
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# after0:
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# ...
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# decrement of countN
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# conditional branch to loopN
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# afterN:
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#
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# Each load occupies 6 bytes. Each decrement and branch occupies 4
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# bytes if BRCTG can be used, otherwise it occupies 10 bytes (AGHI + BRCL).
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# This means that loop 5 contains 4 * 6 + 0xffd8 + 4 * 4 == 0x10000 bytes
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# and is therefore (just) in range. Loop 6 is out of range.
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#
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# CHECK: brctg {{%r[0-9]+}}
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# CHECK: brctg {{%r[0-9]+}}
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# CHECK: brctg {{%r[0-9]+}}
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# CHECK: brctg {{%r[0-9]+}}
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# CHECK: brctg {{%r[0-9]+}}
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# CHECK: aghi {{%r[0-9]+}}, -1
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# CHECK: jglh
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# CHECK: aghi {{%r[0-9]+}}, -1
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# CHECK: jglh
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# CHECK: aghi {{%r[0-9]+}}, -1
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# CHECK: jglh
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from __future__ import print_function
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branch_blocks = 8
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main_size = 0xFFD8
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print("define void @f1(i8 *%base, i64 *%counts) {")
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print("entry:")
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for i in range(branch_blocks - 1, -1, -1):
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print(" %%countptr%d = getelementptr i64, i64 *%%counts, i64 %d" % (i, i))
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print(" %%initcount%d = load i64 , i64 *%%countptr%d" % (i, i))
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print(" br label %%loop%d" % i)
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print("loop%d:" % i)
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block1 = "entry" if i == branch_blocks - 1 else "loop%d" % (i + 1)
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block2 = "loop0" if i == 0 else "after%d" % (i - 1)
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print(
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(
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" %%count%d = phi i64 [ %%initcount%d, %%%s ],"
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" [ %%nextcount%d, %%%s ]" % (i, i, block1, i, block2)
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)
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)
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a, b = 1, 1
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for i in range(0, main_size, 6):
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a, b = b, a + b
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offset = 4096 + b % 500000
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value = a % 256
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print(" %%ptr%d = getelementptr i8, i8 *%%base, i64 %d" % (i, offset))
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print(" store volatile i8 %d, i8 *%%ptr%d" % (value, i))
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for i in range(branch_blocks):
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print(" %%nextcount%d = add i64 %%count%d, -1" % (i, i))
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print(" %%test%d = icmp ne i64 %%nextcount%d, 0" % (i, i))
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print(" br i1 %%test%d, label %%loop%d, label %%after%d" % (i, i, i))
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print("")
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print("after%d:" % i)
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print(" ret void")
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print("}")
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