forked from OSchip/llvm-project
70 lines
2.1 KiB
LLVM
70 lines
2.1 KiB
LLVM
; RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs < %s | FileCheck %s
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@var32 = global [3 x i32] zeroinitializer
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@var64 = global [3 x i64] zeroinitializer
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@var32_align64 = global [3 x i32] zeroinitializer, align 8
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define i64 @test_align32() {
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; CHECK: test_align32:
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%addr = bitcast [3 x i32]* @var32 to i64*
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; Since @var32 is only guaranteed to be aligned to 32-bits, it's invalid to
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; emit an "LDR x0, [x0, #:lo12:var32] instruction to implement this load.
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%val = load i64* %addr
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; CHECK: adrp [[HIBITS:x[0-9]+]], var32
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; CHECK: add x[[ADDR:[0-9]+]], [[HIBITS]], #:lo12:var32
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; CHECK: ldr x0, [x[[ADDR]]]
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ret i64 %val
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}
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define i64 @test_align64() {
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; CHECK: test_align64:
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%addr = bitcast [3 x i64]* @var64 to i64*
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; However, var64 *is* properly aligned and emitting an adrp/add/ldr would be
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; inefficient.
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%val = load i64* %addr
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; CHECK: adrp x[[HIBITS:[0-9]+]], var64
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; CHECK-NOT: add x[[HIBITS]]
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; CHECK: ldr x0, [x[[HIBITS]], #:lo12:var64]
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ret i64 %val
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}
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define i64 @test_var32_align64() {
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; CHECK: test_var32_align64:
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%addr = bitcast [3 x i32]* @var32_align64 to i64*
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; Since @var32 is only guaranteed to be aligned to 32-bits, it's invalid to
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; emit an "LDR x0, [x0, #:lo12:var32] instruction to implement this load.
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%val = load i64* %addr
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; CHECK: adrp x[[HIBITS:[0-9]+]], var32_align64
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; CHECK-NOT: add x[[HIBITS]]
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; CHECK: ldr x0, [x[[HIBITS]], #:lo12:var32_align64]
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ret i64 %val
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}
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@yet_another_var = external global {i32, i32}
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define i64 @test_yet_another_var() {
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; CHECK: test_yet_another_var:
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; @yet_another_var has a preferred alignment of 8, but that's not enough if
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; we're going to be linking against other things. Its ABI alignment is only 4
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; so we can't fold the load.
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%val = load i64* bitcast({i32, i32}* @yet_another_var to i64*)
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; CHECK: adrp [[HIBITS:x[0-9]+]], yet_another_var
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; CHECK: add x[[ADDR:[0-9]+]], [[HIBITS]], #:lo12:yet_another_var
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; CHECK: ldr x0, [x[[ADDR]]]
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ret i64 %val
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}
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define i64()* @test_functions() {
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; CHECK: test_functions:
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ret i64()* @test_yet_another_var
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; CHECK: adrp [[HIBITS:x[0-9]+]], test_yet_another_var
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; CHECK: add x0, [[HIBITS]], #:lo12:test_yet_another_var
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}
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