1 ; RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs < %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 7 define i64 @test_align32() { 8 ; CHECK-LABEL: test_align32: 9 %addr = bitcast [3 x i32]* @var32 to i64* 10 11 ; Since @var32 is only guaranteed to be aligned to 32-bits, it's invalid to 12 ; emit an "LDR x0, [x0, #:lo12:var32] instruction to implement this load. 13 %val = load i64* %addr 14 ; CHECK: adrp [[HIBITS:x[0-9]+]], var32 15 ; CHECK: add x[[ADDR:[0-9]+]], [[HIBITS]], #:lo12:var32 16 ; CHECK: ldr x0, [x[[ADDR]]] 17 18 ret i64 %val 19 } 20 21 define i64 @test_align64() { 22 ; CHECK-LABEL: test_align64: 23 %addr = bitcast [3 x i64]* @var64 to i64* 24 25 ; However, var64 *is* properly aligned and emitting an adrp/add/ldr would be 26 ; inefficient. 27 %val = load i64* %addr 28 ; CHECK: adrp x[[HIBITS:[0-9]+]], var64 29 ; CHECK-NOT: add x[[HIBITS]] 30 ; CHECK: ldr x0, [x[[HIBITS]], #:lo12:var64] 31 32 ret i64 %val 33 } 34 35 define i64 @test_var32_align64() { 36 ; CHECK-LABEL: test_var32_align64: 37 %addr = bitcast [3 x i32]* @var32_align64 to i64* 38 39 ; Since @var32 is only guaranteed to be aligned to 32-bits, it's invalid to 40 ; emit an "LDR x0, [x0, #:lo12:var32] instruction to implement this load. 41 %val = load i64* %addr 42 ; CHECK: adrp x[[HIBITS:[0-9]+]], var32_align64 43 ; CHECK-NOT: add x[[HIBITS]] 44 ; CHECK: ldr x0, [x[[HIBITS]], #:lo12:var32_align64] 45 46 ret i64 %val 47 } 48 49 @yet_another_var = external global {i32, i32} 50 51 define i64 @test_yet_another_var() { 52 ; CHECK-LABEL: test_yet_another_var: 53 54 ; @yet_another_var has a preferred alignment of 8, but that's not enough if 55 ; we're going to be linking against other things. Its ABI alignment is only 4 56 ; so we can't fold the load. 57 %val = load i64* bitcast({i32, i32}* @yet_another_var to i64*) 58 ; CHECK: adrp [[HIBITS:x[0-9]+]], yet_another_var 59 ; CHECK: add x[[ADDR:[0-9]+]], [[HIBITS]], #:lo12:yet_another_var 60 ; CHECK: ldr x0, [x[[ADDR]]] 61 ret i64 %val 62 } 63 64 define i64()* @test_functions() { 65 ; CHECK-LABEL: test_functions: 66 ret i64()* @test_yet_another_var 67 ; CHECK: adrp [[HIBITS:x[0-9]+]], test_yet_another_var 68 ; CHECK: add x0, [[HIBITS]], #:lo12:test_yet_another_var 69 } 70
