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https://github.com/c64scene-ar/llvm-6502.git
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086791eca2
One unusual feature of the z architecture is that the result of a previous load can be reused indefinitely for subsequent loads, even if a cache-coherent store to that location is performed by another CPU. A special serializing instruction must be used if you want to force a load to be reattempted. Since volatile loads are not supposed to be omitted in this way, we should insert a serializing instruction before each such load. The same goes for atomic loads. The patch implements this at the IR->DAG boundary, in a similar way to atomic fences. It is a no-op for targets other than SystemZ. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196905 91177308-0d34-0410-b5e6-96231b3b80d8
83 lines
2.1 KiB
Python
83 lines
2.1 KiB
Python
# Test normal conditional branches in cases where block alignments cause
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# some branches to be out of range.
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# RUN: python %s | llc -mtriple=s390x-linux-gnu -align-all-blocks=8 | FileCheck %s
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# Construct:
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#
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# b0:
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# conditional branch to end
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# ...
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# b<N>:
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# conditional branch to end
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# b<N+1>:
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# conditional branch to b0
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# ...
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# b<2*N>:
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# conditional branch to b0
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# end:
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#
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# with N == 256 + 4. The -align-all-blocks=8 option ensures that all blocks
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# are 256 bytes in size. The first 4 blocks and the last 4 blocks are then
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# out of range.
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#
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# CHECK: c %r4, 0(%r3)
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# CHECK: jge [[LABEL:\.L[^ ]*]]
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# CHECK: c %r4, 4(%r3)
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# CHECK: jge [[LABEL]]
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# CHECK: c %r4, 8(%r3)
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# CHECK: jge [[LABEL]]
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# CHECK: c %r4, 12(%r3)
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# CHECK: jge [[LABEL]]
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# CHECK: c %r4, 16(%r3)
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# CHECK: je [[LABEL]]
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# CHECK: c %r4, 20(%r3)
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# CHECK: je [[LABEL]]
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# CHECK: c %r4, 24(%r3)
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# CHECK: je [[LABEL]]
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# CHECK: c %r4, 28(%r3)
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# CHECK: je [[LABEL]]
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# ...lots of other blocks...
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# CHECK: c %r4, 1004(%r3)
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# CHECK: je [[LABEL:\.L[^ ]*]]
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# CHECK: c %r4, 1008(%r3)
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# CHECK: je [[LABEL]]
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# CHECK: c %r4, 1012(%r3)
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# CHECK: je [[LABEL]]
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# CHECK: c %r4, 1016(%r3)
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# CHECK: je [[LABEL]]
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# CHECK: c %r4, 1020(%r3)
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# CHECK: je [[LABEL]]
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# CHECK: c %r4, 1024(%r3)
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# CHECK: jge [[LABEL]]
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# CHECK: c %r4, 1028(%r3)
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# CHECK: jge [[LABEL]]
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# CHECK: c %r4, 1032(%r3)
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# CHECK: jge [[LABEL]]
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# CHECK: c %r4, 1036(%r3)
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# CHECK: jge [[LABEL]]
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blocks = 256 + 4
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print 'define void @f1(i8 *%base, i32 *%stop, i32 %limit) {'
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print 'entry:'
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print ' br label %b0'
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print ''
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a, b = 1, 1
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for i in xrange(blocks):
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a, b = b, a + b
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value = a % 256
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next = 'b%d' % (i + 1) if i + 1 < blocks else 'end'
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other = 'end' if 2 * i < blocks else 'b0'
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print 'b%d:' % i
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print ' store volatile i8 %d, i8 *%%base' % value
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print ' %%astop%d = getelementptr i32 *%%stop, i64 %d' % (i, i)
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print ' %%acur%d = load i32 *%%astop%d' % (i, i)
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print ' %%atest%d = icmp eq i32 %%limit, %%acur%d' % (i, i)
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print ' br i1 %%atest%d, label %%%s, label %%%s' % (i, other, next)
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print ''
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print '%s:' % next
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print ' ret void'
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print '}'
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