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[LSR] Add test for multi-edge latch (NFC) 

This is additional test coverage for D72519.
This commit is contained in:
Nikita Popov 2021-02-06 18:14:21 +01:00
parent 3a27933ec2
commit 624ce59bba
1 changed files with 48 additions and 0 deletions
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48
llvm/test/Transforms/LoopStrengthReduce/multi-edge-latch.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -loop-reduce < %s | FileCheck %s
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
define void @test(i8* %p.base, i8 %x) {
; CHECK-LABEL: @test(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i8 [[X:%.*]], label [[WHILE_END:%.*]] [
; CHECK-NEXT: i8 10, label [[WHILE_BODY_PREHEADER:%.*]]
; CHECK-NEXT: i8 20, label [[WHILE_BODY_PREHEADER]]
; CHECK-NEXT: ]
; CHECK: while.body.preheader:
; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, i8* [[P_BASE:%.*]], i64 1
; CHECK-NEXT: br label [[WHILE_BODY:%.*]]
; CHECK: while.body:
; CHECK-NEXT: [[LSR_IV:%.*]] = phi i8* [ [[SCEVGEP1:%.*]], [[WHILE_BODY_BACKEDGE:%.*]] ], [ [[SCEVGEP]], [[WHILE_BODY_PREHEADER]] ]
; CHECK-NEXT: [[Y:%.*]] = load i8, i8* [[LSR_IV]], align 1
; CHECK-NEXT: switch i8 [[Y]], label [[WHILE_END_LOOPEXIT:%.*]] [
; CHECK-NEXT: i8 10, label [[WHILE_BODY_BACKEDGE]]
; CHECK-NEXT: i8 20, label [[WHILE_BODY_BACKEDGE]]
; CHECK-NEXT: ]
; CHECK: while.body.backedge:
; CHECK-NEXT: [[SCEVGEP1]] = getelementptr i8, i8* [[LSR_IV]], i64 1
; CHECK-NEXT: br label [[WHILE_BODY]]
; CHECK: while.end.loopexit:
; CHECK-NEXT: br label [[WHILE_END]]
; CHECK: while.end:
; CHECK-NEXT: ret void
;
entry:
switch i8 %x, label %while.end [
i8 10, label %while.body
i8 20, label %while.body
]
while.body:
%p = phi i8* [ %p.inc, %while.body ], [ %p.inc, %while.body ], [ %p.base, %entry ], [ %p.base, %entry ]
%p.inc = getelementptr inbounds i8, i8* %p, i64 1
%y = load i8, i8* %p.inc, align 1
switch i8 %y, label %while.end [
i8 10, label %while.body
i8 20, label %while.body
]
while.end:
ret void
}