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Fix part of PR12457. Patch by Justin Bogner! 

llvm-svn: 183886
This commit is contained in:
Richard Smith 2013-06-13 05:04:16 +00:00
parent f24e6e747b
commit 80b3c8e32f
2 changed files with 62 additions and 1 deletions
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34
clang/lib/AST/ExprConstant.cpp
View File

@ -5691,6 +5691,40 @@ bool IntExprEvaluator::VisitCallExpr(const CallExpr *E) {
return Success(Val.byteSwap(), E);
}
case Builtin::BI__builtin_clz:
case Builtin::BI__builtin_clzl:
case Builtin::BI__builtin_clzll: {
APSInt Val;
if (!EvaluateInteger(E->getArg(0), Val, Info))
return false;
if (!Val)
return Error(E);
return Success(Val.countLeadingZeros(), E);
}
case Builtin::BI__builtin_ctz:
case Builtin::BI__builtin_ctzl:
case Builtin::BI__builtin_ctzll: {
APSInt Val;
if (!EvaluateInteger(E->getArg(0), Val, Info))
return false;
if (!Val)
return Error(E);
return Success(Val.countTrailingZeros(), E);
}
case Builtin::BI__builtin_popcount:
case Builtin::BI__builtin_popcountl:
case Builtin::BI__builtin_popcountll: {
APSInt Val;
if (!EvaluateInteger(E->getArg(0), Val, Info))
return false;
return Success(Val.countPopulation(), E);
}
case Builtin::BI__builtin_classify_type:
return Success(EvaluateBuiltinClassifyType(E), E);

29
clang/test/Sema/constant-builtins-2.c
View File

@ -1,4 +1,4 @@
// RUN: %clang_cc1 -fsyntax-only %s
// RUN: %clang_cc1 -fsyntax-only -verify %s
// Math stuff
@ -41,6 +41,33 @@ long double g18 = __builtin_copysignl(1.0L, -1.0L);
//float g20 = __builtin_powif(2.0f, 4);
//long double g21 = __builtin_powil(2.0L, 4);
#define BITSIZE(x) (sizeof(x) * 8)
char g22[__builtin_clz(1) == BITSIZE(int) - 1 ? 1 : -1];
char g23[__builtin_clz(7) == BITSIZE(int) - 3 ? 1 : -1];
char g24[__builtin_clz(1 << (BITSIZE(int) - 1)) == 0 ? 1 : -1];
int g25 = __builtin_clz(0); // expected-error {{not a compile-time constant}}
char g26[__builtin_clzl(0xFL) == BITSIZE(long) - 4 ? 1 : -1];
char g27[__builtin_clzll(0xFFLL) == BITSIZE(long long) - 8 ? 1 : -1];
char g28[__builtin_ctz(1) == 0 ? 1 : -1];
char g29[__builtin_ctz(8) == 3 ? 1 : -1];
char g30[__builtin_ctz(1 << (BITSIZE(int) - 1)) == BITSIZE(int) - 1 ? 1 : -1];
int g31 = __builtin_ctz(0); // expected-error {{not a compile-time constant}}
char g32[__builtin_ctzl(0x10L) == 4 ? 1 : -1];
char g33[__builtin_ctzll(0x100LL) == 8 ? 1 : -1];
char g34[__builtin_popcount(0) == 0 ? 1 : -1];
char g35[__builtin_popcount(0xF0F0) == 8 ? 1 : -1];
char g36[__builtin_popcount(~0) == BITSIZE(int) ? 1 : -1];
char g37[__builtin_popcount(~0L) == BITSIZE(int) ? 1 : -1];
char g38[__builtin_popcountl(0L) == 0 ? 1 : -1];
char g39[__builtin_popcountl(0xF0F0L) == 8 ? 1 : -1];
char g40[__builtin_popcountl(~0L) == BITSIZE(long) ? 1 : -1];
char g41[__builtin_popcountll(0LL) == 0 ? 1 : -1];
char g42[__builtin_popcountll(0xF0F0LL) == 8 ? 1 : -1];
char g43[__builtin_popcountll(~0LL) == BITSIZE(long long) ? 1 : -1];
#undef BITSIZE
// GCC misc stuff
extern int f();