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6584d94610
Weak symbols cannot use the small code model's usual ADRP sequences since the instruction simply may not be able to encode a value of 0. This redirects them to use the GOT, which hopefully linkers are able to cope with even in the static relocation model. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205426 91177308-0d34-0410-b5e6-96231b3b80d8
52 lines
1.7 KiB
LLVM
52 lines
1.7 KiB
LLVM
; RUN: llc -mtriple=arm64-none-linux-gnu -o - < %s | FileCheck %s
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; RUN: llc -mtriple=arm64-none-linux-gnu -code-model=large -o - < %s | FileCheck --check-prefix=CHECK-LARGE %s
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declare extern_weak i32 @var()
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define i32()* @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 litpool entry.
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ret i32()* @var
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; CHECK: adrp x[[VAR:[0-9]+]], :got:var
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; CHECK: ldr x0, [x[[VAR]], :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_g3:var
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; CHECK-LARGE: movk x0, #:abs_g2_nc:var
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; CHECK-LARGE: movk x0, #:abs_g1_nc:var
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; CHECK-LARGE: movk x0, #:abs_g0_nc:var
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}
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@arr_var = extern_weak global [10 x i32]
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define i32* @bar() {
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%addr = getelementptr [10 x i32]* @arr_var, i32 0, i32 5
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; CHECK: adrp x[[ARR_VAR_HI:[0-9]+]], :got:arr_var
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; CHECK: ldr [[ARR_VAR:x[0-9]+]], [x[[ARR_VAR_HI]], :got_lo12:arr_var]
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; CHECK: add x0, [[ARR_VAR]], #20
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ret i32* %addr
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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 [[ARR_VAR:x[0-9]+]], #:abs_g3:arr_var
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; CHECK-LARGE: movk [[ARR_VAR]], #:abs_g2_nc:arr_var
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; CHECK-LARGE: movk [[ARR_VAR]], #:abs_g1_nc:arr_var
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; CHECK-LARGE: movk [[ARR_VAR]], #:abs_g0_nc:arr_var
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}
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@defined_weak_var = internal unnamed_addr global i32 0
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define i32* @wibble() {
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ret i32* @defined_weak_var
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; CHECK: adrp [[BASE:x[0-9]+]], defined_weak_var
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; CHECK: add x0, [[BASE]], :lo12:defined_weak_var
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; CHECK-LARGE: movz x0, #:abs_g3:defined_weak_var
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; CHECK-LARGE: movk x0, #:abs_g2_nc:defined_weak_var
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; CHECK-LARGE: movk x0, #:abs_g1_nc:defined_weak_var
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; CHECK-LARGE: movk x0, #:abs_g0_nc:defined_weak_var
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}
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