77 lines
2.7 KiB
Python
77 lines
2.7 KiB
Python
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# Test cases where we spill from one frame index to another, both of which
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# are out of range of MVC, and both of which need emergency spill slots.
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# RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s
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# CHECK: f1:
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# CHECK: %fallthru
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# CHECK-DAG: stg [[REG1:%r[0-9]+]], 8168(%r15)
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# CHECK-DAG: stg [[REG2:%r[0-9]+]], 8176(%r15)
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# CHECK-DAG: lay [[REG3:%r[0-9]+]], 8192(%r15)
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# CHECK-DAG: lay [[REG4:%r[0-9]+]], 4096(%r15)
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# CHECK: mvc 0(8,[[REG3]]), 4088([[REG4]])
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# CHECK-DAG: lg [[REG1]], 8168(%r15)
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# CHECK-DAG: lg [[REG2]], 8176(%r15)
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# CHECK: %skip
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# CHECK: br %r14
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# Arrange for %foo's spill slot to be at 8184(%r15) and the alloca area to be at
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# 8192(%r15). The two emergency spill slots live below that, so this requires
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# the first 8168 bytes to be used for the call. 160 of these bytes are
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# allocated for the ABI frame. There are also 5 argument registers, one of
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# which is used as a base pointer.
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from __future__ import print_function
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args = int((8168 - 160) / 8 + (5 - 1))
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print('declare i64 *@foo(i64 *%s)' % (', i64' * args))
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print('declare void @bar(i64 *)')
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print('')
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print('define i64 @f1(i64 %foo) {')
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print('entry:')
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# Make the allocation big, so that it goes at the top of the frame.
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print(' %array = alloca [1000 x i64]')
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print(' %area = getelementptr [1000 x i64], [1000 x i64] *%array, i64 0, i64 0')
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print(' %%base = call i64 *@foo(i64 *%%area%s)' % (', i64 0' * args))
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print('')
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# Make sure all GPRs are used. One is needed for the stack pointer and
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# another for %base, so we need 14 live values.
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count = 14
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for i in range(count):
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print(' %%ptr%d = getelementptr i64, i64 *%%base, i64 %d' % (i, i / 2))
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print(' %%val%d = load volatile i64 , i64 *%%ptr%d' % (i, i))
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print('')
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# Encourage the register allocator to give preference to these %vals
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# by using them several times.
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for j in range(4):
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for i in range(count):
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print(' store volatile i64 %%val%d, i64 *%%ptr%d' % (i, i))
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print('')
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# Copy the incoming argument, which we expect to be spilled, to the frame
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# index for the alloca area. Also throw in a volatile store, so that this
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# block cannot be reordered with the surrounding code.
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print(' %cond = icmp eq i64 %val0, %val1')
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print(' br i1 %cond, label %skip, label %fallthru')
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print('')
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print('fallthru:')
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print(' store i64 %foo, i64 *%area')
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print(' store volatile i64 %val0, i64 *%ptr0')
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print(' br label %skip')
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print('')
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print('skip:')
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# Use each %val a few more times to emphasise the point, and to make sure
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# that they are live across the store of %foo.
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for j in range(4):
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for i in range(count):
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print(' store volatile i64 %%val%d, i64 *%%ptr%d' % (i, i))
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print('')
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print(' call void @bar(i64 *%area)')
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print(' ret i64 0')
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print('}')
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