042e0883cb
with respect to the lower "left-hand-side bitwidth" bits, even when negative); see OpenCL spec 6.3j. This patch both implements this behaviour in the code generator and "constant folding" bits of Sema, and also prevents tests to detect undefinedness in terms of the weaker C99 or C++ specifications from being applied. llvm-svn: 171755
29 lines
842 B
Common Lisp
29 lines
842 B
Common Lisp
// RUN: %clang_cc1 -x cl -O1 -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
|
|
// OpenCL essentially reduces all shift amounts to the last word-size bits before evaluating.
|
|
// Test this both for variables and constants evaluated in the front-end.
|
|
|
|
|
|
//CHECK: @positiveShift32
|
|
int positiveShift32(int a,int b) {
|
|
//CHECK: %shl.mask = and i32 %b, 31
|
|
//CHECK-NEXT: %shl = shl i32 %a, %shl.mask
|
|
int c = a<<b;
|
|
int d = ((int)1)<<33;
|
|
//CHECK-NEXT: %add = add nsw i32 %shl, 2
|
|
int e = c + d;
|
|
//CHECK-NEXT: ret i32 %add
|
|
return e;
|
|
}
|
|
|
|
//CHECK: @positiveShift64
|
|
long positiveShift64(long a,long b) {
|
|
//CHECK: %shr.mask = and i64 %b, 63
|
|
//CHECK-NEXT: %shr = ashr i64 %a, %shr.mask
|
|
long c = a>>b;
|
|
long d = ((long)8)>>65;
|
|
//CHECK-NEXT: %add = add nsw i64 %shr, 4
|
|
long e = c + d;
|
|
//CHECK-NEXT: ret i64 %add
|
|
return e;
|
|
}
|