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Recognize ${:uid} escapes in intel syntax inline asm

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It looks like this logic was duplicated long ago and the GCC side of
things has grown additional functionality. We need ${:uid} at least to
generate unique MS inline asm labels (PR23715), so expose these.

llvm-svn: 288092
This commit is contained in:
Reid Kleckner 2016-11-29 00:29:27 +00:00
parent cc71c27f30
commit fb316ff4a3
2 changed files with 48 additions and 0 deletions
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17
lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
View File

@ -193,6 +193,23 @@ static void EmitMSInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
}
if (Done) break;
// If we have ${:foo}, then this is not a real operand reference, it is a
// "magic" string reference, just like in .td files. Arrange to call
// PrintSpecial.
if (LastEmitted[0] == '{' && LastEmitted[1] == ':') {
LastEmitted += 2;
const char *StrStart = LastEmitted;
const char *StrEnd = strchr(StrStart, '}');
if (!StrEnd)
report_fatal_error("Unterminated ${:foo} operand in inline asm"
" string: '" + Twine(AsmStr) + "'");
std::string Val(StrStart, StrEnd);
AP->PrintSpecial(MI, OS, Val.c_str());
LastEmitted = StrEnd+1;
break;
}
const char *IDStart = LastEmitted;
const char *IDEnd = IDStart;
while (*IDEnd >= '0' && *IDEnd <= '9') ++IDEnd;

31
test/CodeGen/X86/ms-inline-asm.ll
View File

@ -126,6 +126,37 @@ entry:
; CHECK: ret
}
; Make sure ${:uid} works. Clang uses it for MS inline asm labels.
;
; C source:
; int uid() {
; int r;
; __asm {
; xor eax, eax
; wloop:
; inc eax
; cmp eax, 42
; jne wloop
; mov r, eax
; }
; return r;
; }
define i32 @uid() {
entry:
%r = alloca i32, align 4
%0 = bitcast i32* %r to i8*
call void asm sideeffect inteldialect "xor eax, eax\0A\09.L__MSASMLABEL_.${:uid}__wloop:\0A\09inc eax\0A\09cmp eax, $$42\0A\09jne .L__MSASMLABEL_.${:uid}__wloop\0A\09mov dword ptr $0, eax", "=*m,~{eax},~{flags},~{dirflag},~{fpsr},~{flags}"(i32* nonnull %r)
%1 = load i32, i32* %r, align 4
ret i32 %1
; CHECK-LABEL: uid:
; CHECK: {{## InlineAsm Start|#APP}}
; CHECK: .L__MSASMLABEL_.0__wloop:
; CHECK: jne .L__MSASMLABEL_.0__wloop
; CHECK: .att_syntax
; CHECK: {{## InlineAsm End|#NO_APP}}
; CHECK: ret
}
declare hidden void @other_func()
define void @naked() #0 {