llvm-mirror/test/CodeGen/AArch64/arm64-collect-loh-garbage-crash.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

38 lines
1.9 KiB
LLVM

; RUN: llc -o - %s -mtriple=arm64-apple-ios -O3 -aarch64-enable-collect-loh | FileCheck %s
; Check that the LOH analysis does not crash when the analysed chained
; contains instructions that are filtered out.
;
; Before the fix for <rdar://problem/16041712>, these cases were removed
; from the main container. Now, the deterministic container does not allow
; to remove arbitrary values, so we have to live with garbage values.
; <rdar://problem/16041712>
%"class.H4ISP::H4ISPDevice" = type { i32 (%"class.H4ISP::H4ISPDevice"*, i32, i8*, i8*)*, i8*, i32*, %"class.H4ISP::H4ISPCameraManager"* }
%"class.H4ISP::H4ISPCameraManager" = type opaque
declare i32 @_ZN5H4ISP11H4ISPDevice32ISP_SelectBestMIPIFrequencyIndexEjPj(%"class.H4ISP::H4ISPDevice"*)
@pH4ISPDevice = hidden global %"class.H4ISP::H4ISPDevice"* null, align 8
; CHECK-LABEL: _foo:
; CHECK: ret
; CHECK-NOT: .loh AdrpLdrGotLdr
define void @foo() {
entry:
br label %if.then83
if.then83: ; preds = %if.end81
%tmp = load %"class.H4ISP::H4ISPDevice"*, %"class.H4ISP::H4ISPDevice"** @pH4ISPDevice, align 8
%call84 = call i32 @_ZN5H4ISP11H4ISPDevice32ISP_SelectBestMIPIFrequencyIndexEjPj(%"class.H4ISP::H4ISPDevice"* %tmp) #19
tail call void asm sideeffect "", "~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27}"()
%tmp2 = load %"class.H4ISP::H4ISPDevice"*, %"class.H4ISP::H4ISPDevice"** @pH4ISPDevice, align 8
tail call void asm sideeffect "", "~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x28}"()
%pCameraManager.i268 = getelementptr inbounds %"class.H4ISP::H4ISPDevice", %"class.H4ISP::H4ISPDevice"* %tmp2, i64 0, i32 3
%tmp3 = load %"class.H4ISP::H4ISPCameraManager"*, %"class.H4ISP::H4ISPCameraManager"** %pCameraManager.i268, align 8
%tobool.i269 = icmp eq %"class.H4ISP::H4ISPCameraManager"* %tmp3, null
br i1 %tobool.i269, label %if.then83, label %end
end:
ret void
}