derek.holloway
7502bf64a4
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73 lines
2.0 KiB
LLVM
73 lines
2.0 KiB
LLVM
; RUN: llc -mtriple=thumbv7-apple-ios8.0 %s -o - | FileCheck %s
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; This checks that alignments greater than 4 are respected by APCS
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; targets. Mostly here to make sure *some* correct code is created after some
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; simplifying refactoring; at the time of writing there were no actual APCS
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; users of byval alignments > 4, so no real calls for ABI stability.
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; "byval align 16" can't fit in any regs with an ptr taking up r0.
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define i32 @test_align16(ptr, ptr byval([4 x i32]) align 16 %b) {
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; CHECK-LABEL: test_align16:
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; CHECK-NOT: sub sp
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; CHECK: push {r4, r7, lr}
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; CHECK: add r7, sp, #4
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; CHECK: ldr r0, [r7, #8]
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call void @bar()
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%val = load i32, ptr %b
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ret i32 %val
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}
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; byval align 8 can, but we used to incorrectly set r7 here (miscalculating the
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; space taken up by arg regs).
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define i32 @test_align8(ptr, ptr byval([4 x i32]) align 8 %b) {
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; CHECK-LABEL: test_align8:
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; CHECK: sub sp, #8
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; CHECK: push {r4, r7, lr}
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; CHECK: add r7, sp, #4
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; CHECK: strd r2, r3, [r7, #8]
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; CHECK: ldr r0, [r7, #8]
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call void @bar()
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%val = load i32, ptr %b
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ret i32 %val
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}
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; "byval align 32" can't fit in regs no matter what: it would be misaligned
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; unless the incoming stack was deliberately misaligned.
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define i32 @test_align32(ptr, ptr byval([4 x i32]) align 32 %b) {
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; CHECK-LABEL: test_align32:
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; CHECK-NOT: sub sp
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; CHECK: push {r4, r7, lr}
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; CHECK: add r7, sp, #4
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; CHECK: ldr r0, [r7, #8]
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call void @bar()
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%val = load i32, ptr %b
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ret i32 %val
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}
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; When passing an object "byval align N", the stack must be at least N-aligned.
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define void @test_call_align16() {
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; CHECK-LABEL: test_call_align16:
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; CHECK: push {r4, r7, lr}
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; CHECK: add r7, sp, #4
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; CHECK: mov [[TMP:r[0-9]+]], sp
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; CHECK: bfc [[TMP]], #0, #4
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; CHECK: mov sp, [[TMP]]
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; While we're here, make sure the caller also puts it at sp
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; CHECK: mov r[[BASE:[0-9]+]], sp
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; CHECK: vst1.32 {d{{[0-9]+}}, d{{[0-9]+}}}, [r[[BASE]]]
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call i32 @test_align16(ptr null, ptr byval([4 x i32]) align 16 @var)
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ret void
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}
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@var = global [4 x i32] zeroinitializer
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declare void @bar()
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