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fcf8735ea4
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
38 lines
1.9 KiB
LLVM
38 lines
1.9 KiB
LLVM
; RUN: llc -o - %s -mtriple=arm64-apple-ios -O3 -aarch64-enable-collect-loh | FileCheck %s
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; Check that the LOH analysis does not crash when the analysed chained
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; contains instructions that are filtered out.
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;
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; Before the fix for <rdar://problem/16041712>, these cases were removed
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; from the main container. Now, the deterministic container does not allow
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; to remove arbitrary values, so we have to live with garbage values.
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; <rdar://problem/16041712>
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%"class.H4ISP::H4ISPDevice" = type { i32 (%"class.H4ISP::H4ISPDevice"*, i32, i8*, i8*)*, i8*, i32*, %"class.H4ISP::H4ISPCameraManager"* }
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%"class.H4ISP::H4ISPCameraManager" = type opaque
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declare i32 @_ZN5H4ISP11H4ISPDevice32ISP_SelectBestMIPIFrequencyIndexEjPj(%"class.H4ISP::H4ISPDevice"*)
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@pH4ISPDevice = hidden global %"class.H4ISP::H4ISPDevice"* null, align 8
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; CHECK-LABEL: _foo:
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; CHECK: ret
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; CHECK-NOT: .loh AdrpLdrGotLdr
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define void @foo() {
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entry:
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br label %if.then83
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if.then83: ; preds = %if.end81
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%tmp = load %"class.H4ISP::H4ISPDevice"*, %"class.H4ISP::H4ISPDevice"** @pH4ISPDevice, align 8
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%call84 = call i32 @_ZN5H4ISP11H4ISPDevice32ISP_SelectBestMIPIFrequencyIndexEjPj(%"class.H4ISP::H4ISPDevice"* %tmp) #19
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tail call void asm sideeffect "", "~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27}"()
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%tmp2 = load %"class.H4ISP::H4ISPDevice"*, %"class.H4ISP::H4ISPDevice"** @pH4ISPDevice, align 8
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tail call void asm sideeffect "", "~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x28}"()
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%pCameraManager.i268 = getelementptr inbounds %"class.H4ISP::H4ISPDevice", %"class.H4ISP::H4ISPDevice"* %tmp2, i64 0, i32 3
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%tmp3 = load %"class.H4ISP::H4ISPCameraManager"*, %"class.H4ISP::H4ISPCameraManager"** %pCameraManager.i268, align 8
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%tobool.i269 = icmp eq %"class.H4ISP::H4ISPCameraManager"* %tmp3, null
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br i1 %tobool.i269, label %if.then83, label %end
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end:
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ret void
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}
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