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llvm-project/llvm/test/CodeGen/AArch64/loh.mir

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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
2017-01-07 03:22:01 +08:00
# RUN: llc -o /dev/null %s -mtriple=aarch64-apple-ios -run-pass=aarch64-collect-loh -debug-only=aarch64-collect-loh 2>&1 | FileCheck %s
# REQUIRES: asserts
--- |
define void @func0() { ret void }
declare void @extfunc()
@g0 = external global i32
@g1 = external global i32
@g2 = external global i32
@g3 = external global i32
@g4 = external global i32
@g5 = external global i32
...
---
# Check various LOH variants. Remember that the algorithms walks the basic
# blocks backwards.
# CHECK-LABEL: ********** AArch64 Collect LOH **********
# CHECK-LABEL: Looking in function func0
name: func0
tracksRegLiveness: true
body: |
bb.0:
; CHECK: Adding MCLOH_AdrpAdrp:
; CHECK-NEXT: %X1<def> = ADRP <ga:@g3>
; CHECK-NEXT: %X1<def> = ADRP <ga:@g4>
; CHECK-NEXT: Adding MCLOH_AdrpAdrp:
; CHECK-NEXT: %X1<def> = ADRP <ga:@g2>
; CHECK-NEXT: %X1<def> = ADRP <ga:@g3>
; CHECK-NEXT: Adding MCLOH_AdrpAdrp:
; CHECK-NEXT: %X0<def> = ADRP <ga:@g0>
; CHECK-NEXT: %X0<def> = ADRP <ga:@g1>
%x0 = ADRP target-flags(aarch64-page) @g0
%x0 = ADRP target-flags(aarch64-page) @g1
%x1 = ADRP target-flags(aarch64-page) @g2
%x1 = ADRP target-flags(aarch64-page) @g3
%x1 = ADRP target-flags(aarch64-page) @g4
bb.1:
; CHECK-NEXT: Adding MCLOH_AdrpAdd:
; CHECK-NEXT: %X20<def> = ADRP <ga:@g0>
; CHECK-NEXT: %X3<def> = ADDXri %X20, <ga:@g0>
; CHECK-NEXT: Adding MCLOH_AdrpAdd:
; CHECK-NEXT: %X1<def> = ADRP <ga:@g0>
; CHECK-NEXT: %X1<def> = ADDXri %X1, <ga:@g0>
%x1 = ADRP target-flags(aarch64-page) @g0
%x9 = SUBXri undef %x11, 5, 0 ; should not affect MCLOH formation
%x1 = ADDXri %x1, target-flags(aarch64-pageoff) @g0, 0
%x20 = ADRP target-flags(aarch64-page) @g0
BL @extfunc, csr_aarch64_aapcs ; should not clobber X20
%x3 = ADDXri %x20, target-flags(aarch64-pageoff) @g0, 0
bb.2:
; CHECK-NOT: MCLOH_AdrpAdd
%x9 = ADRP target-flags(aarch64-page) @g0
BL @extfunc, csr_aarch64_aapcs ; clobbers x9
; Verification requires the use of 'undef' in front of the clobbered %x9
%x9 = ADDXri undef %x9, target-flags(aarch64-pageoff) @g0, 0
bb.3:
; CHECK-NOT: MCLOH_AdrpAdd
%x10 = ADRP target-flags(aarch64-page) @g0
HINT 0, implicit def %x10 ; clobbers x10
%x10 = ADDXri %x10, target-flags(aarch64-pageoff) @g0, 0
bb.4:
; Cannot produce a LOH for multiple users
; CHECK-NOT: MCLOH_AdrpAdd
%x10 = ADRP target-flags(aarch64-page) @g0
HINT 0, implicit def %x10 ; clobbers x10
%x11 = ADDXri %x10, target-flags(aarch64-pageoff) @g0, 0
%x12 = ADDXri %x10, target-flags(aarch64-pageoff) @g0, 0
bb.5:
; CHECK-NEXT: Adding MCLOH_AdrpLdr:
; CHECK-NEXT: %X5<def> = ADRP <ga:@g2>
; CHECK-NEXT: %S6<def> = LDRSui %X5, <ga:@g2>
; CHECK-NEXT: Adding MCLOH_AdrpLdr:
; CHECK-NEXT: %X4<def> = ADRP <ga:@g2>
; CHECK-NEXT: %X4<def> = LDRXui %X4, <ga:@g2>
%x4 = ADRP target-flags(aarch64-page) @g2
%x4 = LDRXui %x4, target-flags(aarch64-pageoff) @g2
%x5 = ADRP target-flags(aarch64-page) @g2
%s6 = LDRSui %x5, target-flags(aarch64-pageoff) @g2
bb.6:
; CHECK-NEXT: Adding MCLOH_AdrpLdrGot:
; CHECK-NEXT: %X5<def> = ADRP <ga:@g2>
; CHECK-NEXT: %X6<def> = LDRXui %X5, <ga:@g2>
; CHECK-NEXT: Adding MCLOH_AdrpLdrGot:
; CHECK-NEXT: %X4<def> = ADRP <ga:@g2>
; CHECK-NEXT: %X4<def> = LDRXui %X4, <ga:@g2>
%x4 = ADRP target-flags(aarch64-page, aarch64-got) @g2
%x4 = LDRXui %x4, target-flags(aarch64-pageoff, aarch64-got) @g2
%x5 = ADRP target-flags(aarch64-page, aarch64-got) @g2
%x6 = LDRXui %x5, target-flags(aarch64-pageoff, aarch64-got) @g2
bb.7:
; CHECK-NOT: Adding MCLOH_AdrpLdrGot:
; Loading a float value from a GOT table makes no sense so this should not
; produce an LOH.
%x11 = ADRP target-flags(aarch64-page, aarch64-got) @g5
%s11 = LDRSui %x11, target-flags(aarch64-pageoff, aarch64-got) @g5
bb.8:
; CHECK-NEXT: Adding MCLOH_AdrpAddLdr:
; CHECK-NEXT: %X7<def> = ADRP <ga:@g3>[TF=1]
; CHECK-NEXT: %X8<def> = ADDXri %X7, <ga:@g3>
; CHECK-NEXT: %D1<def> = LDRDui %X8, 8
%x7 = ADRP target-flags(aarch64-page) @g3
%x8 = ADDXri %x7, target-flags(aarch64-pageoff) @g3, 0
%d1 = LDRDui %x8, 8
bb.9:
; CHECK-NEXT: Adding MCLOH_AdrpAdd:
; CHECK-NEXT: %X3<def> = ADRP <ga:@g3>
; CHECK-NEXT: %X3<def> = ADDXri %X3, <ga:@g3>
; CHECK-NEXT: Adding MCLOH_AdrpAdd:
; CHECK-NEXT: %X5<def> = ADRP <ga:@g3>
; CHECK-NEXT: %X2<def> = ADDXri %X5, <ga:@g3>
; CHECK-NEXT: Adding MCLOH_AdrpAddStr:
; CHECK-NEXT: %X1<def> = ADRP <ga:@g3>
; CHECK-NEXT: %X1<def> = ADDXri %X1, <ga:@g3>
; CHECK-NEXT: STRXui %XZR, %X1, 16
%x1 = ADRP target-flags(aarch64-page) @g3
%x1 = ADDXri %x1, target-flags(aarch64-pageoff) @g3, 0
STRXui %xzr, %x1, 16
; This sequence should just produce an AdrpAdd (not AdrpAddStr)
%x5 = ADRP target-flags(aarch64-page) @g3
%x2 = ADDXri %x5, target-flags(aarch64-pageoff) @g3, 0
STRXui %x2, undef %x11, 16
; This sequence should just produce an AdrpAdd (not AdrpAddStr)
%x3 = ADRP target-flags(aarch64-page) @g3
%x3 = ADDXri %x3, target-flags(aarch64-pageoff) @g3, 0
STRXui %x3, %x3, 16
bb.10:
; CHECK-NEXT: Adding MCLOH_AdrpLdr:
; CHECK-NEXT: %X2<def> = ADRP <ga:@g3>
; CHECK-NEXT: %X2<def> = LDRXui %X2, <ga:@g3>
; CHECK-NEXT: Adding MCLOH_AdrpLdrGotLdr:
; CHECK-NEXT: %X1<def> = ADRP <ga:@g4>
; CHECK-NEXT: %X1<def> = LDRXui %X1, <ga:@g4>
; CHECK-NEXT: %X1<def> = LDRXui %X1, 24
%x1 = ADRP target-flags(aarch64-page, aarch64-got) @g4
%x1 = LDRXui %x1, target-flags(aarch64-pageoff, aarch64-got) @g4
%x1 = LDRXui %x1, 24
; Should just produce a MCLOH_AdrpLdr (not MCLOH_AdrpLdrGotLdr)
%x2 = ADRP target-flags(aarch64-page) @g3
%x2 = LDRXui %x2, target-flags(aarch64-pageoff) @g3
%x2 = LDRXui %x2, 24
bb.11:
; CHECK-NEXT: Adding MCLOH_AdrpLdr
; CHECK-NEXT: %X5<def> = ADRP <ga:@g1>
; CHECK-NEXT: %X5<def> = LDRXui %X5, <ga:@g1>
; CHECK-NEXT: Adding MCLOH_AdrpLdrGotStr:
; CHECK-NEXT: %X1<def> = ADRP <ga:@g4>
; CHECK-NEXT: %X1<def> = LDRXui %X1, <ga:@g4>
; CHECK-NEXT: STRXui %XZR, %X1, 32
%x1 = ADRP target-flags(aarch64-page, aarch64-got) @g4
%x1 = LDRXui %x1, target-flags(aarch64-pageoff, aarch64-got) @g4
STRXui %xzr, %x1, 32
; Should just produce a MCLOH_AdrpLdr (not MCLOH_AdrpLdrGotStr)
%x5 = ADRP target-flags(aarch64-page) @g1
%x5 = LDRXui %x5, target-flags(aarch64-pageoff) @g1
STRXui undef %x11, %x5, 32
bb.12:
; CHECK-NOT: MCLOH_AdrpAdrp
; CHECK: Adding MCLOH_AdrpAddLdr
; %X9<def> = ADRP <ga:@g4>
; %X9<def> = ADDXri %X9, <ga:@g4>
; %X5<def> = LDRXui %X9, 0
%x9 = ADRP target-flags(aarch64-page, aarch64-got) @g4
%x9 = ADDXri %x9, target-flags(aarch64-pageoff, aarch64-got) @g4, 0
%x5 = LDRXui %x9, 0
%x9 = ADRP target-flags(aarch64-page, aarch64-got) @g5
bb.13:
successors: %bb.14
; Cannot produce a LOH for multiple users
; CHECK-NOT: MCLOH_AdrpAdd
%x10 = ADRP target-flags(aarch64-page) @g0
%x11 = ADDXri %x10, target-flags(aarch64-pageoff) @g0, 0
B %bb.14
bb.14:
liveins: %x10
%x12 = ADDXri %x10, target-flags(aarch64-pageoff) @g0, 0
...