Use a heralded conversion to bool in inline-asm constraints.

llvm-svn: 131170

2 files changed, 11 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaStmt.cpp b/clang/lib/Sema/SemaStmt.cpp
index a60fcb7097c..60fcb10d536 100644
--- a/clang/lib/Sema/SemaStmt.cpp
+++ b/clang/lib/Sema/SemaStmt.cpp
@@ -2016,7 +2016,9 @@ StmtResult Sema::ActOnAsmStmt(SourceLocation AsmLoc, bool IsSimple,
     if (InputDomain == AD_Int && OutputDomain == AD_Int &&
         !isOperandMentioned(InputOpNo, Pieces) &&
         InputExpr->isEvaluatable(Context)) {
-      InputExpr = ImpCastExprToType(InputExpr, OutTy, CK_IntegralCast).take();
+      CastKind castKind =
+        (OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast);
+      InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).take();
       Exprs[InputOpNo] = InputExpr;
       NS->setInputExpr(i, InputExpr);
       continue;
diff --git a/clang/test/Sema/asm.c b/clang/test/Sema/asm.c
index 7f0f396b9d8..d8161c819b9 100644
--- a/clang/test/Sema/asm.c
+++ b/clang/test/Sema/asm.c
@@ -105,3 +105,11 @@ void test10(void){
   register int r asm ("cx");
   register int rr asm ("rr_asm"); // expected-error{{unknown register name 'rr_asm' in asm}}
 }
+
+// This is just an assert because of the boolean conversion.
+// Feel free to change the assembly to something sensible if it causes a problem.
+// rdar://problem/9414925
+void test11(void) {
+  _Bool b;
+  asm volatile ("movb %%gs:%P2,%b0" : "=q"(b) : "0"(0), "i"(5L));
+}