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[NFC][ARM] Add a test that potentially causes endless combine loop with D62266

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llvm-svn: 362159
This commit is contained in:
Roman Lebedev 2019-05-30 21:41:21 +00:00
parent 1aab9f557d
commit c2565c1056
1 changed files with 60 additions and 0 deletions
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test/CodeGen/ARM/sub-from-const-hoisting.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv6m-arm-none-eabi"
; From https://reviews.llvm.org/D62266
; This used to cause an endless loop in DAGCombine,
; since we were hoisting two binops with constants, one constant being opaque,
; which is why they weren't getting constant folded.
@a = dso_local local_unnamed_addr global i32 0, align 4
@b = dso_local local_unnamed_addr global i32 0, align 4
; Function Attrs: minsize nounwind optsize
define dso_local i32 @c() local_unnamed_addr #0 {
; CHECK-LABEL: c:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: .save {r4, lr}
; CHECK-NEXT: push {r4, lr}
; CHECK-NEXT: ldr r0, .LCPI0_0
; CHECK-NEXT: ldr r0, [r0]
; CHECK-NEXT: ldr r4, .LCPI0_1
; CHECK-NEXT: subs r0, r4, r0
; CHECK-NEXT: adds r0, r0, #1
; CHECK-NEXT: bl d
; CHECK-NEXT: ldr r0, .LCPI0_2
; CHECK-NEXT: ldr r0, [r0]
; CHECK-NEXT: cmp r0, r4
; CHECK-NEXT: ble .LBB0_2
; CHECK-NEXT: @ %bb.1: @ %if.then
; CHECK-NEXT: bl e
; CHECK-NEXT: .LBB0_2: @ %if.end
; CHECK-NEXT: pop {r4, pc}
; CHECK-NEXT: .p2align 2
; CHECK-NEXT: @ %bb.3:
; CHECK-NEXT: .LCPI0_0:
; CHECK-NEXT: .long a
; CHECK-NEXT: .LCPI0_1:
; CHECK-NEXT: .long 1999 @ 0x7cf
; CHECK-NEXT: .LCPI0_2:
; CHECK-NEXT: .long b
entry:
%0 = load i32, i32* @a, align 4
%sub = sub nsw i32 2000, %0
%call = tail call i32 bitcast (i32 (...)* @d to i32 (i32)*)(i32 %sub) #2
%1 = load i32, i32* @b, align 4
%cmp = icmp sgt i32 %1, 1999
br i1 %cmp, label %if.then, label %if.end
if.then: ; preds = %entry
%call1 = tail call i32 bitcast (i32 (...)* @e to i32 ()*)() #2
br label %if.end
if.end: ; preds = %if.then, %entry
ret i32 undef
}
declare dso_local i32 @d(...) local_unnamed_addr #1
declare dso_local i32 @e(...) local_unnamed_addr #1