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404f8de41a
This option indicates copy relocations support is available from the linker when building as PIE and allows accesses to extern globals to avoid the GOT. Differential Revision: https://reviews.llvm.org/D24849 llvm-svn: 284160
120 lines
2.9 KiB
LLVM
120 lines
2.9 KiB
LLVM
; RUN: llc < %s -march=x86-64 -mcpu=generic -mtriple=x86_64-linux-gnu -relocation-model=pic -pie-copy-relocations \
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; RUN: | FileCheck -check-prefix=X64 %s
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; RUN: llc < %s -emulated-tls -march=x86 -mcpu=generic -mtriple=i386-linux-gnu -relocation-model=pic -pie-copy-relocations \
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; RUN: | FileCheck -check-prefix=X32 %s
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; External Linkage
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@a = global i32 0, align 4
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define i32 @my_access_global_a() #0 {
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; X32-LABEL: my_access_global_a:
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; X32: addl $_GLOBAL_OFFSET_TABLE_{{.*}}, %eax
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; X32-NEXT: movl a@GOTOFF(%eax), %eax
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; X64-LABEL: my_access_global_a:
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; X64: movl a(%rip), %eax
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entry:
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%0 = load i32, i32* @a, align 4
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ret i32 %0
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}
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; WeakAny Linkage
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@b = weak global i32 0, align 4
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define i32 @my_access_global_b() #0 {
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; X32-LABEL: my_access_global_b:
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; X32: addl $_GLOBAL_OFFSET_TABLE_{{.*}}, %eax
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; X32-NEXT: movl b@GOTOFF(%eax), %eax
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; X64-LABEL: my_access_global_b:
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; X64: movl b(%rip), %eax
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entry:
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%0 = load i32, i32* @b, align 4
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ret i32 %0
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}
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; Internal Linkage
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@c = internal global i32 0, align 4
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define i32 @my_access_global_c() #0 {
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; X32-LABEL: my_access_global_c:
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; X32: addl $_GLOBAL_OFFSET_TABLE_{{.*}}, %eax
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; X32-NEXT: movl c@GOTOFF(%eax), %eax
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; X64-LABEL: my_access_global_c:
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; X64: movl c(%rip), %eax
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entry:
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%0 = load i32, i32* @c, align 4
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ret i32 %0
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}
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; External Linkage, only declaration.
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@d = external global i32, align 4
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define i32 @my_access_global_load_d() #0 {
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; X32-LABEL: my_access_global_load_d:
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; X32: addl $_GLOBAL_OFFSET_TABLE_{{.*}}, %eax
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; X32-NEXT: movl d@GOTOFF(%eax), %eax
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; X64-LABEL: my_access_global_load_d:
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; X64: movl d(%rip), %eax
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entry:
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%0 = load i32, i32* @d, align 4
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ret i32 %0
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}
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; External Linkage, only declaration, store a value.
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define i32 @my_access_global_store_d() #0 {
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; X32-LABEL: my_access_global_store_d:
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; X32: addl $_GLOBAL_OFFSET_TABLE_{{.*}}, %eax
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; X32-NEXT: movl $2, d@GOTOFF(%eax)
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; X64-LABEL: my_access_global_store_d:
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; X64: movl $2, d(%rip)
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entry:
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store i32 2, i32* @d, align 4
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ret i32 0
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}
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; External Linkage, function pointer access.
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declare i32 @access_fp(i32 ()*)
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declare i32 @foo()
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define i32 @my_access_fp_foo() #0 {
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; X32-LABEL: my_access_fp_foo:
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; X32: addl $_GLOBAL_OFFSET_TABLE_{{.*}}, %ebx
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; X32-NEXT: movl foo@GOT(%ebx), %eax
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; X64-LABEL: my_access_fp_foo:
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; X64: movq foo@GOTPCREL(%rip), %rdi
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entry:
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%call = call i32 @access_fp(i32 ()* @foo)
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ret i32 %call
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}
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; LinkOnceODR Linkage, function pointer access.
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$bar = comdat any
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define linkonce_odr i32 @bar() comdat {
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entry:
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ret i32 0
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}
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define i32 @my_access_fp_bar() #0 {
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; X32-LABEL: my_access_fp_bar:
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; X32: addl $_GLOBAL_OFFSET_TABLE_{{.*}}, %ebx
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; X32-NEXT: leal bar@GOTOFF(%ebx), %eax
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; X64-LABEL: my_access_fp_bar:
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; X64: leaq bar(%rip), %rdi
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entry:
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%call = call i32 @access_fp(i32 ()* @bar)
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ret i32 %call
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}
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!llvm.module.flags = !{!0, !1}
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!0 = !{i32 1, !"PIC Level", i32 1}
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!1 = !{i32 1, !"PIE Level", i32 1}
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