1; RUN: llc -mtriple=aarch64-linux-gnu -verify-machineinstrs -o - %s | FileCheck %s 2 3@var32 = global [3 x i32] zeroinitializer 4@var64 = global [3 x i64] zeroinitializer 5@var32_align64 = global [3 x i32] zeroinitializer, align 8 6@alias = alias [3 x i32], [3 x i32]* @var32_align64 7 8define i64 @test_align32() { 9; CHECK-LABEL: test_align32: 10 %addr = bitcast [3 x i32]* @var32 to i64* 11 12 ; Since @var32 is only guaranteed to be aligned to 32-bits, it's invalid to 13 ; emit an "LDR x0, [x0, #:lo12:var32] instruction to implement this load. 14 %val = load i64, i64* %addr 15; CHECK: adrp [[HIBITS:x[0-9]+]], var32 16; CHECK: add x[[ADDR:[0-9]+]], [[HIBITS]], {{#?}}:lo12:var32 17; CHECK: ldr x0, [x[[ADDR]]] 18 19 ret i64 %val 20} 21 22define i64 @test_align64() { 23; CHECK-LABEL: test_align64: 24 %addr = bitcast [3 x i64]* @var64 to i64* 25 26 ; However, var64 *is* properly aligned and emitting an adrp/add/ldr would be 27 ; inefficient. 28 %val = load i64, i64* %addr 29; CHECK: adrp x[[HIBITS:[0-9]+]], var64 30; CHECK-NOT: add x[[HIBITS]] 31; CHECK: ldr x0, [x[[HIBITS]], {{#?}}:lo12:var64] 32 33 ret i64 %val 34} 35 36define i64 @test_var32_align64() { 37; CHECK-LABEL: test_var32_align64: 38 %addr = bitcast [3 x i32]* @var32_align64 to i64* 39 40 ; Since @var32 is only guaranteed to be aligned to 32-bits, it's invalid to 41 ; emit an "LDR x0, [x0, #:lo12:var32] instruction to implement this load. 42 %val = load i64, i64* %addr 43; CHECK: adrp x[[HIBITS:[0-9]+]], var32_align64 44; CHECK-NOT: add x[[HIBITS]] 45; CHECK: ldr x0, [x[[HIBITS]], {{#?}}:lo12:var32_align64] 46 47 ret i64 %val 48} 49 50define i64 @test_var32_alias() { 51; CHECK-LABEL: test_var32_alias: 52 %addr = bitcast [3 x i32]* @alias to i64* 53 54 ; Test that we can find the alignment for aliases. 55 %val = load i64, i64* %addr 56; CHECK: adrp x[[HIBITS:[0-9]+]], alias 57; CHECK-NOT: add x[[HIBITS]] 58; CHECK: ldr x0, [x[[HIBITS]], {{#?}}:lo12:alias] 59 60 ret i64 %val 61} 62 63@yet_another_var = external global {i32, i32} 64 65define i64 @test_yet_another_var() { 66; CHECK-LABEL: test_yet_another_var: 67 68 ; @yet_another_var has a preferred alignment of 8, but that's not enough if 69 ; we're going to be linking against other things. Its ABI alignment is only 4 70 ; so we can't fold the load. 71 %val = load i64, i64* bitcast({i32, i32}* @yet_another_var to i64*) 72; CHECK: adrp [[HIBITS:x[0-9]+]], yet_another_var 73; CHECK: add x[[ADDR:[0-9]+]], [[HIBITS]], {{#?}}:lo12:yet_another_var 74; CHECK: ldr x0, [x[[ADDR]]] 75 ret i64 %val 76} 77 78define i64()* @test_functions() { 79; CHECK-LABEL: test_functions: 80 ret i64()* @test_yet_another_var 81; CHECK: adrp [[HIBITS:x[0-9]+]], test_yet_another_var 82; CHECK: add x0, [[HIBITS]], {{#?}}:lo12:test_yet_another_var 83} 84