forked from OSchip/llvm-project
46 lines
1.3 KiB
LLVM
46 lines
1.3 KiB
LLVM
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; RUN: llc %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 -o -
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; When a i64 sub is expanded to subc + sube.
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; libcall #1
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; \
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; \ subc
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; \ / \
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; \ / \
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; \ / libcall #2
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; sube
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;
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; If the libcalls are not serialized (i.e. both have chains which are dag
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; entry), legalizer can serialize them in arbitrary orders. If it's
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; unlucky, it can force libcall #2 before libcall #1 in the above case.
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;
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; subc
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; |
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; libcall #2
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; |
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; libcall #1
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; |
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; sube
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;
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; However since subc and sube are "glued" together, this ends up being a
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; cycle when the scheduler combine subc and sube as a single scheduling
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; unit.
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;
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; The right solution is to fix LegalizeType too chains the libcalls together.
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; However, LegalizeType is not processing nodes in order. The fix now is to
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; fix subc / sube (and addc / adde) to use physical register dependency instead.
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; rdar://10019576
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define void @t() nounwind {
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entry:
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%tmp = load i64* undef, align 4
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%tmp5 = udiv i64 %tmp, 30
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%tmp13 = and i64 %tmp5, 64739244643450880
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%tmp16 = sub i64 0, %tmp13
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%tmp19 = and i64 %tmp16, 63
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%tmp20 = urem i64 %tmp19, 3
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%tmp22 = and i64 %tmp16, -272346829004752
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store i64 %tmp22, i64* undef, align 4
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store i64 %tmp20, i64* undef, align 4
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ret void
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}
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