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1ce4894a3f
Try to use MVC when spilling the destination of a simple load or the source
of a simple store. As explained in the comment, this doesn't yet handle
the case where the load or store location is also a frame index, since
that could lead to two simultaneous scavenger spills, something the
backend can't handle yet. spill-02.py tests that this restriction kicks in,
but unfortunately I've not yet found a case that would fail without it.
The volatile trick I used for other scavenger tests doesn't work here
because we can't use MVC for volatile accesses anyway.
I'm planning on relaxing the restriction later, hopefully with a test
that does trigger the problem...
Tests @f8 and @f9 also showed that L(G)RL and ST(G)RL were wrongly
classified as SimpleBDX{Load,Store}. It wouldn't be easy to test for
that bug separately, which is why I didn't split out the fix as a
separate patch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185434 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
# Test cases where MVC is used for spill slots that end up being out of range.
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# RUN: python %s | llc -mtriple=s390x-linux-gnu | FileCheck %s
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# There are 8 usable call-saved GPRs, two of which are needed for the base
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# registers. The first 160 bytes of the frame are needed for the ABI
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# call frame, and a further 8 bytes are needed for the emergency spill slot.
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# That means we will have at least one out-of-range slot if:
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#
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# count == (4096 - 168) / 8 + 6 + 1 == 498
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#
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# Add in some extra room and check both %r15+4096 (the first out-of-range slot)
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# and %r15+4104.
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#
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# CHECK: f1:
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# CHECK: lay [[REG:%r[0-5]]], 4096(%r15)
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# CHECK: mvc 0(8,[[REG]]), {{[0-9]+}}({{%r[0-9]+}})
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# CHECK: brasl %r14, foo@PLT
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# CHECK: lay [[REG:%r[0-5]]], 4096(%r15)
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# CHECK: mvc {{[0-9]+}}(8,{{%r[0-9]+}}), 8([[REG]])
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# CHECK: br %r14
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count = 500
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print 'declare void @foo()'
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print ''
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print 'define void @f1(i64 *%base0, i64 *%base1) {'
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for i in range(count):
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print ' %%ptr%d = getelementptr i64 *%%base%d, i64 %d' % (i, i % 2, i / 2)
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print ' %%val%d = load i64 *%%ptr%d' % (i, i)
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print ''
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print ' call void @foo()'
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print ''
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for i in range(count):
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print ' store i64 %%val%d, i64 *%%ptr%d' % (i, i)
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print ''
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print ' ret void'
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print '}'
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