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115 lines
3.6 KiB
115 lines
3.6 KiB
4 months ago
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# Test 64-bit COMPARE IMMEDIATE AND BRANCH in cases where the sheer number of
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# instructions causes some branches to be out 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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# before0:
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# conditional branch to after0
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# ...
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# beforeN:
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# conditional branch to after0
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# main:
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# 0xffcc 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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# conditional branch to main
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# afterN:
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#
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# Each conditional branch sequence occupies 12 bytes if it uses a short
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# branch and 16 if it uses a long one. The ones before "main:" have to
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# take the branch length into account, which is 6 for short branches,
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# so the final (0x34 - 6) / 12 == 3 blocks can use short branches.
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# The ones after "main:" do not, so the first 0x34 / 12 == 4 blocks
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# can use short branches. The conservative algorithm we use makes
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# one of the forward branches unnecessarily long, as noted in the
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# check output below.
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#
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cghi [[REG]], 50
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# CHECK: jgl [[LABEL:\.L[^ ]*]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cghi [[REG]], 51
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# CHECK: jgl [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cghi [[REG]], 52
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# CHECK: jgl [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cghi [[REG]], 53
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# CHECK: jgl [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cghi [[REG]], 54
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# CHECK: jgl [[LABEL]]
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# ...as mentioned above, the next one could be a CGIJL instead...
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cghi [[REG]], 55
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# CHECK: jgl [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cgijl [[REG]], 56, [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cgijl [[REG]], 57, [[LABEL]]
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# ...main goes here...
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cgijl [[REG]], 100, [[LABEL:\.L[^ ]*]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cgijl [[REG]], 101, [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cgijl [[REG]], 102, [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cgijl [[REG]], 103, [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cghi [[REG]], 104
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# CHECK: jgl [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cghi [[REG]], 105
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# CHECK: jgl [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cghi [[REG]], 106
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# CHECK: jgl [[LABEL]]
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# CHECK: lgb [[REG:%r[0-5]]], 0(%r3)
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# CHECK: cghi [[REG]], 107
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# CHECK: jgl [[LABEL]]
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from __future__ import print_function
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branch_blocks = 8
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main_size = 0xffcc
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print('@global = global i32 0')
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print('define void @f1(i8 *%base, i8 *%stop) {')
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print('entry:')
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print(' br label %before0')
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print('')
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for i in range(branch_blocks):
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next = 'before%d' % (i + 1) if i + 1 < branch_blocks else 'main'
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print('before%d:' % i)
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print(' %%bcur%d = load i8 , i8 *%%stop' % i)
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print(' %%bext%d = sext i8 %%bcur%d to i64' % (i, i))
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print(' %%btest%d = icmp slt i64 %%bext%d, %d' % (i, i, i + 50))
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print(' br i1 %%btest%d, label %%after0, label %%%s' % (i, next))
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print('')
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print('%s:' % next)
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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(' %%acur%d = load i8 , i8 *%%stop' % i)
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print(' %%aext%d = sext i8 %%acur%d to i64' % (i, i))
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print(' %%atest%d = icmp slt i64 %%aext%d, %d' % (i, i, i + 100))
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print(' br i1 %%atest%d, label %%main, label %%after%d' % (i, i))
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print('')
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print('after%d:' % i)
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print(' %dummy = load volatile i32, i32 *@global')
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print(' ret void')
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print('}')
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