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5d88cb6cf6
ARM seems to prefer that long literals be formed from their little end in order to promote the fusion of the instrs pairs MOV/MOVK and MOVK/MOVK on Cortex A57 and others (v. "Cortex A57 Software Optimisation Guide", section 4.14). Differential revision: https://reviews.llvm.org/D28697 llvm-svn: 292422
59 lines
1.9 KiB
LLVM
59 lines
1.9 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 --check-prefix=CHECK %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 GOT entry for PIC
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; otherwise a litpool entry.
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ret i32()* @var
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; CHECK: adrp x[[ADDRHI:[0-9]+]], :got:var
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; CHECK: 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: movk x0, #:abs_g1_nc:var
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; CHECK-LARGE: movk x0, #:abs_g2_nc:var
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; CHECK-LARGE: movk x0, #:abs_g3: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], [10 x i32]* @arr_var, i32 0, i32 5
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; CHECK: adrp x[[ADDRHI:[0-9]+]], :got:arr_var
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; CHECK: ldr [[BASE:x[0-9]+]], [x[[ADDRHI]], :got_lo12:arr_var]
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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 [[ADDR:x[0-9]+]], #:abs_g0_nc:arr_var
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; CHECK-LARGE: movk [[ADDR]], #:abs_g1_nc:arr_var
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; CHECK-LARGE: movk [[ADDR]], #:abs_g2_nc:arr_var
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; CHECK-LARGE: movk [[ADDR]], #:abs_g3: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_g0_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_g2_nc:defined_weak_var
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; CHECK-LARGE: movk x0, #:abs_g3:defined_weak_var
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}
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