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[inline asm][gcc-compatiblity] "=i" output constraint support 

Ignore ‘i’,’n’,’E’,’F’ as output constraints in inline assembly (gcc compatibility)

Differential Revision: https://reviews.llvm.org/D31383

llvm-svn: 306297
This commit is contained in:
Marina Yatsina 2017-06-26 15:55:51 +00:00
parent 0ad0e5802b
commit 33eb775265
2 changed files with 40 additions and 0 deletions
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5
clang/lib/Basic/TargetInfo.cpp
View File

@ -507,6 +507,11 @@ bool TargetInfo::validateOutputConstraint(ConstraintInfo &Info) const {
case '?': // Disparage slightly code.
case '!': // Disparage severely.
case '*': // Ignore for choosing register preferences.
case 'i': // Ignore i,n,E,F as output constraints (match from the other
// chars)
case 'n':
case 'E':
case 'F':
break; // Pass them.
}

35
clang/test/Sema/asm.c
View File

@ -160,6 +160,41 @@ double test15() {
return ret;
}
void iOutputConstraint(int x){
__asm ("nop" : "=ir" (x) : :); // no-error
__asm ("nop" : "=ri" (x) : :); // no-error
__asm ("nop" : "=ig" (x) : :); // no-error
__asm ("nop" : "=im" (x) : :); // no-error
__asm ("nop" : "=imr" (x) : :); // no-error
__asm ("nop" : "=i" (x) : :); // expected-error{{invalid output constraint '=i' in asm}}
__asm ("nop" : "+i" (x) : :); // expected-error{{invalid output constraint '+i' in asm}}
__asm ("nop" : "=ii" (x) : :); // expected-error{{invalid output constraint '=ii' in asm}}
__asm ("nop" : "=nr" (x) : :); // no-error
__asm ("nop" : "=rn" (x) : :); // no-error
__asm ("nop" : "=ng" (x) : :); // no-error
__asm ("nop" : "=nm" (x) : :); // no-error
__asm ("nop" : "=nmr" (x) : :); // no-error
__asm ("nop" : "=n" (x) : :); // expected-error{{invalid output constraint '=n' in asm}}
__asm ("nop" : "+n" (x) : :); // expected-error{{invalid output constraint '+n' in asm}}
__asm ("nop" : "=nn" (x) : :); // expected-error{{invalid output constraint '=nn' in asm}}
__asm ("nop" : "=Fr" (x) : :); // no-error
__asm ("nop" : "=rF" (x) : :); // no-error
__asm ("nop" : "=Fg" (x) : :); // no-error
__asm ("nop" : "=Fm" (x) : :); // no-error
__asm ("nop" : "=Fmr" (x) : :); // no-error
__asm ("nop" : "=F" (x) : :); // expected-error{{invalid output constraint '=F' in asm}}
__asm ("nop" : "+F" (x) : :); // expected-error{{invalid output constraint '+F' in asm}}
__asm ("nop" : "=FF" (x) : :); // expected-error{{invalid output constraint '=FF' in asm}}
__asm ("nop" : "=Er" (x) : :); // no-error
__asm ("nop" : "=rE" (x) : :); // no-error
__asm ("nop" : "=Eg" (x) : :); // no-error
__asm ("nop" : "=Em" (x) : :); // no-error
__asm ("nop" : "=Emr" (x) : :); // no-error
__asm ("nop" : "=E" (x) : :); // expected-error{{invalid output constraint '=E' in asm}}
__asm ("nop" : "+E" (x) : :); // expected-error{{invalid output constraint '+E' in asm}}
__asm ("nop" : "=EE" (x) : :); // expected-error{{invalid output constraint '=EE' in asm}}
}
// PR19837
struct foo {
int a;