d4cb5d9f2b
Printing the raw symbol is useful in inline asm (e.g. getting the C++
mangled name, referencing a symbol in a custom way while ensuring it is
not optimized out even if internal). Similar constraints are available
in other targets (e.g. "S" for aarch64/riscv, "Cs" for m68k).
```
namespace ns { extern int var, a[4]; }
void foo() {
asm(".pushsection .xxx,\"aw\"; .dc.a %p0; .popsection" :: "Ws"(&ns::var));
asm(".reloc ., BFD_RELOC_NONE, %p0" :: "Ws"(&ns::a[3]));
}
```
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105576
37 lines
1.1 KiB
LLVM
37 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=i686 < %s | FileCheck %s
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; RUN: llc -mtriple=x86_64 < %s | FileCheck %s
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@var = external dso_local global i32, align 4
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@a = external global [4 x i32], align 16
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define dso_local void @test() {
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; CHECK-LABEL: test:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: #APP
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; CHECK-NEXT: # var a+12 test
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; CHECK-NEXT: #NO_APP
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; CHECK-NEXT: ret{{[l|q]}}
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entry:
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%ai = getelementptr inbounds [4 x i32], ptr @a, i64 0, i64 3
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call void asm sideeffect "// ${0:p} ${1:p} ${2:p}", "^Ws,^Ws,^Ws,~{dirflag},~{fpsr},~{flags}"(ptr @var, ptr %ai, ptr @test)
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ret void
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}
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define dso_local void @test_label() {
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; CHECK-LABEL: test_label:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: .Ltmp0: # Block address taken
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; CHECK-NEXT: # %bb.1: # %label
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; CHECK-NEXT: #APP
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; CHECK-NEXT: # .Ltmp0
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; CHECK-NEXT: #NO_APP
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; CHECK-NEXT: ret{{[l|q]}}
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entry:
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br label %label
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label:
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tail call void asm sideeffect "// ${0:p}", "^Ws,~{dirflag},~{fpsr},~{flags}"(ptr blockaddress(@test_label, %label))
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ret void
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}
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