| Tim Northover | 8cda34f | 2015-03-11 18:54:22 +0000 | [diff] [blame^] | 1 | ; RUN: llc -mtriple=thumbv7-apple-ios8.0 %s -o - | FileCheck %s |
| 2 | |
| 3 | ; This checks that alignments greater than 4 are respected by APCS |
| 4 | ; targets. Mostly here to make sure *some* correct code is created after some |
| 5 | ; simplifying refactoring; at the time of writing there were no actual APCS |
| 6 | ; users of byval alignments > 4, so no real calls for ABI stability. |
| 7 | |
| 8 | ; "byval align 16" can't fit in any regs with an i8* taking up r0. |
| 9 | define i32 @test_align16(i8*, [4 x i32]* byval align 16 %b) { |
| 10 | ; CHECK-LABEL: test_align16: |
| 11 | ; CHECK-NOT: sub sp |
| 12 | ; CHECK: push {r4, r7, lr} |
| 13 | ; CHECK: add r7, sp, #4 |
| 14 | |
| 15 | ; CHECK: ldr r0, [r7, #8] |
| 16 | |
| 17 | call void @bar() |
| 18 | %valptr = getelementptr [4 x i32], [4 x i32]* %b, i32 0, i32 0 |
| 19 | %val = load i32, i32* %valptr |
| 20 | ret i32 %val |
| 21 | } |
| 22 | |
| 23 | ; byval align 8 can, but we used to incorrectly set r7 here (miscalculating the |
| 24 | ; space taken up by arg regs). |
| 25 | define i32 @test_align8(i8*, [4 x i32]* byval align 8 %b) { |
| 26 | ; CHECK-LABEL: test_align8: |
| 27 | ; CHECK: sub sp, #8 |
| 28 | ; CHECK: push {r4, r7, lr} |
| 29 | ; CHECK: add r7, sp, #4 |
| 30 | |
| 31 | ; CHECK-DAG: str r2, [r7, #8] |
| 32 | ; CHECK-DAG: str r3, [r7, #12] |
| 33 | |
| 34 | ; CHECK: ldr r0, [r7, #8] |
| 35 | |
| 36 | call void @bar() |
| 37 | %valptr = getelementptr [4 x i32], [4 x i32]* %b, i32 0, i32 0 |
| 38 | %val = load i32, i32* %valptr |
| 39 | ret i32 %val |
| 40 | } |
| 41 | |
| 42 | ; "byval align 32" can't fit in regs no matter what: it would be misaligned |
| 43 | ; unless the incoming stack was deliberately misaligned. |
| 44 | define i32 @test_align32(i8*, [4 x i32]* byval align 32 %b) { |
| 45 | ; CHECK-LABEL: test_align32: |
| 46 | ; CHECK-NOT: sub sp |
| 47 | ; CHECK: push {r4, r7, lr} |
| 48 | ; CHECK: add r7, sp, #4 |
| 49 | |
| 50 | ; CHECK: ldr r0, [r7, #8] |
| 51 | |
| 52 | call void @bar() |
| 53 | %valptr = getelementptr [4 x i32], [4 x i32]* %b, i32 0, i32 0 |
| 54 | %val = load i32, i32* %valptr |
| 55 | ret i32 %val |
| 56 | } |
| 57 | |
| 58 | ; When passing an object "byval align N", the stack must be at least N-aligned. |
| 59 | define void @test_call_align16() { |
| 60 | ; CHECK-LABEL: test_call_align16: |
| 61 | ; CHECK: push {r4, r7, lr} |
| 62 | ; CHECK: add r7, sp, #4 |
| 63 | |
| 64 | ; CHECK: mov [[TMP:r[0-9]+]], sp |
| 65 | ; CHECK: bfc [[TMP]], #0, #4 |
| 66 | ; CHECK: mov sp, [[TMP]] |
| 67 | |
| 68 | ; While we're here, make sure the caller also puts it at sp |
| 69 | ; CHECK: mov r[[BASE:[0-9]+]], sp |
| 70 | ; CHECK: vst1.32 {d{{[0-9]+}}, d{{[0-9]+}}}, [r[[BASE]]] |
| 71 | call i32 @test_align16(i8* null, [4 x i32]* byval align 16 @var) |
| 72 | ret void |
| 73 | } |
| 74 | |
| 75 | @var = global [4 x i32] zeroinitializer |
| 76 | declare void @bar() |