From 846ded2e53c77b43aae86a6ed60772ae46647e63 Mon Sep 17 00:00:00 2001 From: Eli Friedman Date: Wed, 2 Mar 2011 01:49:12 +0000 Subject: PR9350: increment/decrement of char (and anything else narrower than int) can't overflow due to promotion rules; emit a wrapping add for those cases. llvm-svn: 126816 --- clang/test/CodeGen/integer-overflow.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'clang/test/CodeGen/integer-overflow.c') diff --git a/clang/test/CodeGen/integer-overflow.c b/clang/test/CodeGen/integer-overflow.c index 066ef895744..1d460656a1c 100644 --- a/clang/test/CodeGen/integer-overflow.c +++ b/clang/test/CodeGen/integer-overflow.c @@ -50,11 +50,17 @@ void test1() { // TRAPV_HANDLER: foo( --a; - // -fwrapv should turn off inbounds for GEP's, PR9256 extern int* P; ++P; // DEFAULT: getelementptr inbounds i32* // WRAPV: getelementptr i32* // TRAPV: getelementptr inbounds i32* + + // PR9350: char increment never overflows. + extern volatile signed char PR9350; + // DEFAULT: add i8 {{.*}}, 1 + // WRAPV: add i8 {{.*}}, 1 + // TRAPV: add i8 {{.*}}, 1 + ++PR9350; } -- cgit v1.2.3