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5 Commits

Author SHA1 Message Date
Jennifer Yu b8fee677bf Re-check in clang support gun asm goto after fixing tests. 
llvm-svn: 362410
 2019-06-03 15:57:25 +00:00
Erich Keane d0f34fd198 Revert "clang support gnu asm goto." 
This reverts commit 954ec09aed.

Reverting due to test failures as requested by Jennifer Yu.

Conflicts:
	clang/test/CodeGen/asm-goto.c

llvm-svn: 362106
 2019-05-30 15:38:02 +00:00
Jennifer Yu 954ec09aed clang support gnu asm goto. 
Syntax:
  asm [volatile] goto ( AssemblerTemplate
                      :
                      : InputOperands
                      : Clobbers
                      : GotoLabels)

https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html

New llvm IR is "callbr" for inline asm goto instead "call" for inline asm
For:
asm goto("testl %0, %0; jne %l1;" :: "r"(cond)::label_true, loop);
IR:
callbr void asm sideeffect "testl $0, $0; jne ${1:l};", "r,X,X,~{dirflag},~{fpsr},~{flags}"(i32 %0, i8* blockaddress(@foo, %label_true), i8* blockaddress(@foo, %loop)) #1
          to label %asm.fallthrough [label %label_true, label %loop], !srcloc !3

asm.fallthrough:                                

Compiler need to generate:
1> a dummy constarint 'X' for each label.
2> an unique fallthrough label for each asm goto stmt " asm.fallthrough%number".


Diagnostic 
1>	duplicate asm operand name are used in output, input and label.
2>	goto out of scope.

llvm-svn: 362045
 2019-05-30 01:05:46 +00:00
Renato Golin 1f04213e98 [x86] Force mixes asm syntax test to check for x86 
llvm-svn: 266993
 2016-04-21 14:40:06 +00:00
Denis Zobnin 628b022a0e Correctly parse GCC-style asm line following MS-style asm line. 
Quit parsing MS-style inline assembly if the following statement has GCC style.
Enables compilation of code like

void f() {
  __asm mov ebx, ecx
  __asm__("movl %ecx, %edx");
}

Differential Revision: http://reviews.llvm.org/D18652

llvm-svn: 266976
 2016-04-21 10:59:18 +00:00