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https://github.com/c64scene-ar/llvm-6502.git
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45db92038b
The MOVZ/MOVK instruction sequence may not be the most efficient (a literal-pool load could be better) but adding that would require reinstating the ConstantIslands pass. For now the sequence is correct, and that's enough. Beware, as of commit GNU ld does not appear to support the relocations needed for this. Its primary purpose (for now) will be to support JITed code, since in that case there is no guarantee of where your code will end up in memory relative to external symbols it references. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181117 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.7 KiB
LLVM
54 lines
1.7 KiB
LLVM
; RUN: llc -mtriple=aarch64-none-linux-gnu -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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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: .LCPI0_0:
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; CHECK-NEXT: .xword var
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; CHECK: ldr x0, [{{x[0-9]+}}, #:lo12:.LCPI0_0]
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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: .LCPI1_0:
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; CHECK-NEXT: .xword arr_var
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; CHECK: ldr [[BASE:x[0-9]+]], [{{x[0-9]+}}, #:lo12:.LCPI1_0]
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; CHECK: add x0, [[BASE]], #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 x0, #:abs_g3:arr_var
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; CHECK-LARGE: movk x0, #:abs_g2_nc:arr_var
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; CHECK-LARGE: movk x0, #:abs_g1_nc:arr_var
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; CHECK-LARGE: movk x0, #: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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} |