llvm-mirror/test/CodeGen/AArch64/arm64-collect-loh-str.ll
Matthias Braun fcf8735ea4 AArch64CollectLOH: Rewrite as block-local analysis.
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 9e6cedb0a4f14364d6511597a9160305e7d34493.

llvm-svn: 291266
2017-01-06 19:22:01 +00:00

24 lines
886 B
LLVM

; RUN: llc -o - %s -mtriple=arm64-apple-ios -O2 | FileCheck %s
; Test case for <rdar://problem/15942912>.
; AdrpAddStr cannot be used when the store uses same
; register as address and value. Indeed, the related
; if applied, may completely remove the definition or
; at least provide a wrong one (with the offset folded
; into the definition).
%struct.anon = type { i32*, i32** }
@pptp_wan_head = internal global %struct.anon zeroinitializer, align 8
; CHECK-LABEL: _pptp_wan_init
; CHECK: ret
; CHECK-NOT: AdrpAddStr
define i32 @pptp_wan_init() {
entry:
store i32* null, i32** getelementptr inbounds (%struct.anon, %struct.anon* @pptp_wan_head, i64 0, i32 0), align 8
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
ret i32 0
}