From 4da89c87b2b6ca31f1015ec19aae65a02971ea9a Mon Sep 17 00:00:00 2001
From: John McCall <rjmccall@apple.com>
Date: Tue, 10 May 2011 23:39:47 +0000
Subject: [PATCH] Use a heralded conversion to bool in inline-asm constraints.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@131170 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Sema/SemaStmt.cpp | 4 +++-
 test/Sema/asm.c       | 8 ++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/Sema/SemaStmt.cpp b/lib/Sema/SemaStmt.cpp
index a60fcb7097..60fcb10d53 100644
--- a/lib/Sema/SemaStmt.cpp
+++ b/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/test/Sema/asm.c b/test/Sema/asm.c
index 7f0f396b9d..d8161c819b 100644
--- a/test/Sema/asm.c
+++ b/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));
+}
-- 
2.40.0