derek.holloway
7502bf64a4
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80 lines
2.5 KiB
LLVM
80 lines
2.5 KiB
LLVM
; RUN: llc -mtriple=aarch64-linux-gnu -verify-machineinstrs -o - %s | FileCheck %s
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@var32 = dso_local global [3 x i32] zeroinitializer
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@var64 = dso_local global [3 x i64] zeroinitializer
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@var32_align64 = dso_local global [3 x i32] zeroinitializer, align 8
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@alias = dso_local alias [3 x i32], ptr @var32_align64
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define dso_local i64 @test_align32() {
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; CHECK-LABEL: test_align32:
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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, ptr @var32
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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 dso_local i64 @test_align64() {
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; CHECK-LABEL: test_align64:
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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, ptr @var64
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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 dso_local i64 @test_var32_align64() {
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; CHECK-LABEL: test_var32_align64:
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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, ptr @var32_align64
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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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define dso_local i64 @test_var32_alias() {
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; CHECK-LABEL: test_var32_alias:
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; We don't know anything about the alignment of aliases.
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%val = load i64, ptr @alias
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; CHECK: adrp x[[HIBITS:[0-9]+]], alias
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; CHECK: add x[[ADDR:[0-9]+]], x[[HIBITS]], {{#?}}:lo12:alias
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; CHECK: ldr x0, [x[[ADDR]]]
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ret i64 %val
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}
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@yet_another_var = external dso_local global {i32, i32}
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define dso_local i64 @test_yet_another_var() {
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; CHECK-LABEL: 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, ptr @yet_another_var
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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 dso_local ptr @test_functions() {
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; CHECK-LABEL: test_functions:
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ret ptr @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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