}
Value *LibCallSimplifier::optimizeCall(CallInst *CI) {
+ Function *F = CI->getParent()->getParent();
+ // We don't want to "optimize" if the function doesn't want builtins.
+ if (F->hasFnAttribute("no-builtin")) return 0;
return Impl->optimizeCall(CI);
}
--- /dev/null
+; RUN: opt < %s -instcombine -S | FileCheck %s
+@.str = private unnamed_addr constant [14 x i8] c"hello world!\0A\00", align 1
+
+; CHECK: @foo
+; CHECK: printf
+define void @foo() nounwind ssp uwtable "no-builtin" {
+entry:
+ %call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([14 x i8]* @.str, i32 0, i32 0))
+ ret void
+}
+
+; CHECK: @bar
+; CHECK: puts
+define void @bar() nounwind ssp uwtable {
+entry:
+ %call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([14 x i8]* @.str, i32 0, i32 0))
+ ret void
+}
+
+declare i32 @printf(i8*, ...)
+
+attributes #0 = { nounwind ssp uwtable "no-builtin" }
+attributes #1 = { nounwind ssp uwtable }