derek.holloway
7502bf64a4
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64 lines
2.3 KiB
LLVM
64 lines
2.3 KiB
LLVM
; RUN: llc -mtriple=aarch64-none-linux-gnu -relocation-model=pic -o - %s | FileCheck %s
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; RUN: llc -mtriple=aarch64-none-linux-gnu -relocation-model=static -o - < %s | FileCheck %s
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; RUN: llc -mtriple=aarch64-none-linux-gnu -code-model=large -o - %s | FileCheck --check-prefix=CHECK-LARGE %s
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; RUN: llc -mtriple=aarch64-none-elf -code-model=tiny -o - %s | FileCheck --check-prefix=CHECK-TINY %s
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declare extern_weak dso_local i32 @var()
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define ptr @foo() {
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; The usual ADRP/ADD pair can't be used for a weak reference because it must
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; evaluate to 0 if the symbol is undefined. We use a GOT entry for PIC
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; otherwise a litpool entry.
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ret ptr @var
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; CHECK: adrp x[[ADDRHI:[0-9]+]], :got:var
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; CHECK-NEXT: ldr x0, [x[[ADDRHI]], :got_lo12:var]
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; In the large model, the usual relocations are absolute and can
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; materialise 0.
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; CHECK-LARGE: movz x0, #:abs_g0_nc:var
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; CHECK-LARGE-NEXT: movk x0, #:abs_g1_nc:var
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; CHECK-LARGE-NEXT: movk x0, #:abs_g2_nc:var
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; CHECK-LARGE-NEXT: movk x0, #:abs_g3:var
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; In the tiny codemodel we us a got relocated LDR.
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; CHECK-TINY: ldr x0, :got:var
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}
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@arr_var = extern_weak global [10 x i32]
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define ptr @bar() {
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%addr = getelementptr [10 x i32], ptr @arr_var, i32 0, i32 5
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; CHECK: adrp x[[ADDRHI:[0-9]+]], :got:arr_var
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; CHECK-NEXT: ldr [[BASE:x[0-9]+]], [x[[ADDRHI]], :got_lo12:arr_var]
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; CHECK-NEXT: add x0, [[BASE]], #20
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ret ptr %addr
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; Note, In the large model, if dso_local, the relocations are absolute and can materialise 0.
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; CHECK-LARGE: adrp x[[ADDR:[0-9]+]], :got:arr_var
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; CHECK-LARGE-NEXT: ldr x[[ADDR]], [x[[ADDR]], :got_lo12:arr_var]
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; CHECK-LARGE-NEXT: add x0, x[[ADDR]], #20
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; CHECK-TINY: ldr [[BASE:x[0-9]+]], :got:arr_var
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; CHECK-TINY-NEXT: add x0, [[BASE]], #20
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}
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@defined_weak_var = internal unnamed_addr global i32 0
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define ptr @wibble() {
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ret ptr @defined_weak_var
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; CHECK: adrp [[BASE:x[0-9]+]], defined_weak_var
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; CHECK-NEXT: add x0, [[BASE]], :lo12:defined_weak_var
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; CHECK-LARGE: movz x0, #:abs_g0_nc:defined_weak_var
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; CHECK-LARGE-NEXT: movk x0, #:abs_g1_nc:defined_weak_var
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; CHECK-LARGE-NEXT: movk x0, #:abs_g2_nc:defined_weak_var
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; CHECK-LARGE-NEXT: movk x0, #:abs_g3:defined_weak_var
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; CHECK-TINY: adr x0, defined_weak_var
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}
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