2 ; RUN: llc < %s -debug-only=codegenprepare -o /dev/null 2>&1 | FileCheck %s
4 ; These are regression tests for
5 ; https://bugs.llvm.org/show_bug.cgi?id=34106
6 ; "ARMTargetLowering::isLegalAddressingMode can accept incorrect
7 ; addressing modes for Thumb1 target"
9 ; The Thumb1 target addressing modes don't support scaling.
10 ; It supports: r1 + r2, where r1 and r2 can be the same register.
12 target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
13 target triple = "thumbv6m-arm-none-eabi"
15 ; Test case 01: %n is scaled by 4 (size of i32).
16 ; Expected: GEP cannot be folded into LOAD.
17 ; CHECK: local addrmode: [inbounds Base:%arrayidx]
18 define i32 @load01(i32* %p, i32 %n) nounwind {
20 %arrayidx = getelementptr inbounds i32, i32* %p, i32 %n
21 %0 = load i32, i32* %arrayidx, align 4
25 ; Test case 02: No scale of %n is needed because the size of i8 is 1.
26 ; Expected: GEP can be folded into LOAD.
27 ; CHECK: local addrmode: [inbounds Base:%p + 1*%n]
28 define i8 @load02(i8* %p, i32 %n) nounwind {
30 %arrayidx = getelementptr inbounds i8, i8* %p, i32 %n
31 %0 = load i8, i8* %arrayidx
35 ; Test case 03: 2*%x can be represented as %x + %x.
36 ; Expected: GEP can be folded into LOAD.
37 ; CHECK: local addrmode: [2*%x]
38 define i32 @load03(i32 %x) nounwind {
40 %mul = shl nsw i32 %x, 1
41 %0 = inttoptr i32 %mul to i32*
42 %1 = load i32, i32* %0, align 4