llvm/test/CodeGen/X86/aext-and-trunc.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s --check-prefix=X64
; RUN: llc < %s -mtriple=i686-unknown-linux-gnu | FileCheck %s --check-prefix=X86

; Regression tests for the (zext (and (trunc x) C)) -> (and x C) fold in
; visitZERO_EXTEND (and symmetrically in visitANY_EXTEND). On X86,
; isTruncateFree(i32->i8) is true but isZExtFree(i8->i32) is false, so the
; fold fires to avoid redundant narrow-AND + movzx sequences.

; Basic (zext (and (trunc i32) C)) -> (and i32 C) pattern.
define i32 @zext_and_trunc_i32(i32 %x) {
; X64-LABEL: zext_and_trunc_i32:
; X64:       # %bb.0:
; X64-NEXT:    movl %edi, %eax
; X64-NEXT:    andl $7, %eax
; X64-NEXT:    retq
;
; X86-LABEL: zext_and_trunc_i32:
; X86:       # %bb.0:
; X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
; X86-NEXT:    andl $7, %eax
; X86-NEXT:    retl
  %trunc = trunc i32 %x to i8
  %and = and i8 %trunc, 7
  %zext = zext i8 %and to i32
  ret i32 %zext
}

; (zext (and (trunc i64) C)) -> (and i32 C) on x86-64.
define i32 @zext_and_trunc_i64(i64 %x) {
; X64-LABEL: zext_and_trunc_i64:
; X64:       # %bb.0:
; X64-NEXT:    movq %rdi, %rax
; X64-NEXT:    andl $15, %eax
; X64-NEXT:    # kill: def $eax killed $eax killed $rax
; X64-NEXT:    retq
;
; X86-LABEL: zext_and_trunc_i64:
; X86:       # %bb.0:
; X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
; X86-NEXT:    andl $15, %eax
; X86-NEXT:    retl
  %trunc = trunc i64 %x to i8
  %and = and i8 %trunc, 15
  %zext = zext i8 %and to i32
  ret i32 %zext
}