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4bdd2c5750
Re-apply r288561: This time with a fix where the ADDs that are part of a
3 instruction LOH would not invalidate the "LastAdrp" state. This fixes
http://llvm.org/PR31361
Previously this pass was using up to 5% compile time in some cases which
is a bit much for what it is doing. The pass featured a full blown
data-flow analysis which in the default configuration was restricted to a
single block.
This rewrites the pass under the assumption that we only ever work on a
single block. This is done in a single pass maintaining a state machine
per general purpose register to catch LOH patterns.
Differential Revision: https://reviews.llvm.org/D27329
This reverts commit 9e6cedb0a4.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291266 91177308-0d34-0410-b5e6-96231b3b80d8
24 lines
886 B
LLVM
24 lines
886 B
LLVM
; RUN: llc -o - %s -mtriple=arm64-apple-ios -O2 | FileCheck %s
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; Test case for <rdar://problem/15942912>.
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; AdrpAddStr cannot be used when the store uses same
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; register as address and value. Indeed, the related
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; if applied, may completely remove the definition or
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; at least provide a wrong one (with the offset folded
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; into the definition).
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%struct.anon = type { i32*, i32** }
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@pptp_wan_head = internal global %struct.anon zeroinitializer, align 8
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; CHECK-LABEL: _pptp_wan_init
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; CHECK: ret
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; CHECK-NOT: AdrpAddStr
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define i32 @pptp_wan_init() {
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entry:
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store i32* null, i32** getelementptr inbounds (%struct.anon, %struct.anon* @pptp_wan_head, i64 0, i32 0), align 8
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store i32** getelementptr inbounds (%struct.anon, %struct.anon* @pptp_wan_head, i64 0, i32 0), i32*** getelementptr inbounds (%struct.anon, %struct.anon* @pptp_wan_head, i64 0, i32 1), align 8
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ret i32 0
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}
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