1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
; 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
}
|
