zext.ll   [plain text]

; Tests to make sure elimination of casts is working correctly
; RUN: opt < %s -instcombine -S | FileCheck %s

define i64 @test_sext_zext(i16 %A) {
        %c1 = zext i16 %A to i32                ; <i32> [#uses=1]
        %c2 = sext i32 %c1 to i64               ; <i64> [#uses=1]
        ret i64 %c2
; CHECK-NOT: %c1
; CHECK: %c2 = zext i16 %A to i64
; CHECK: ret i64 %c2
}