; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py | |
; RUN: llc < %s -O2 -mtriple=x86_64-unknown-unknown | FileCheck %s | |
; Checks that a zeroing mov is inserted for the trunc/zext pair even when | |
; the source of the zext is an AssertSext node | |
; PR20494 | |
define i64 @main(i64 %a) { | |
; CHECK-LABEL: main: | |
; CHECK: # %bb.0: | |
; CHECK-NEXT: orq $-2, %rdi | |
; CHECK-NEXT: movl %edi, %eax | |
; CHECK-NEXT: retq | |
%or = or i64 %a, -2 | |
%trunc = trunc i64 %or to i32 | |
br label %l | |
l: | |
%ext = zext i32 %trunc to i64 | |
trunc i64 %or to i32 ; to keep the or from being narrowed | |
ret i64 %ext | |
} |