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c69d5b5cbb
This patch re-introduces the "S" inline assembler constraint. This matches
an absolute symbolic address or a label reference. The primary use case is
asm("adrp %0, %1\n\t"
"add %0, %0, :lo12:%1" : "=r"(addr) : "S"(&var));
I say re-introduces as it seems like "S" was implemented in the original
AArch64 backend, but it looks like it wasn't carried forward to the merged
backend. The original implementation had A and L modifiers that could be
used to print ":lo12:" to the string. It looks like gcc doesn't use these
and :lo12: is expected to be written in the inline assembly string so I've
not implemented A and L. Clang already supports the S modifier.
Fixes PR37180
Differential Revision: https://reviews.llvm.org/D46745
llvm-svn: 332444
21 lines
675 B
LLVM
21 lines
675 B
LLVM
;RUN: llc -mtriple=aarch64-none-linux-gnu -mattr=+neon < %s | FileCheck %s
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@var = global i32 0
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define void @test_inline_constraint_S() {
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; CHECK-LABEL: test_inline_constraint_S:
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call void asm sideeffect "adrp x0, $0", "S"(i32* @var)
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call void asm sideeffect "add x0, x0, :lo12:$0", "S"(i32* @var)
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; CHECK: adrp x0, var
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; CHECK: add x0, x0, :lo12:var
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ret void
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}
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define i32 @test_inline_constraint_S_label(i1 %in) {
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; CHECK-LABEL: test_inline_constraint_S_label:
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call void asm sideeffect "adr x0, $0", "S"(i8* blockaddress(@test_inline_constraint_S_label, %loc))
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; CHECK: adr x0, .Ltmp{{[0-9]+}}
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br i1 %in, label %loc, label %loc2
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loc:
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ret i32 0
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loc2:
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ret i32 42
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}
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