xref: /aosp_15_r20/external/llvm/test/CodeGen/X86/fast-isel-trunc-kill-subreg.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)

; RUN: llc %s -o - -fast-isel=true -O1 -verify-machineinstrs | FileCheck %s

target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-unknown"

; This test failed the machine verifier because the trunc at the start of the
; method was extracing a subreg and killing the source register.  The kill flag was
; invalid here as the source of the trunc could still be used elsewhere.

; CHECK-LABEL: @test

define i32 @test(i32 %block8x8) {
bb:
  %tmp9 = trunc i32 %block8x8 to i1
  %tmp10 = zext i1 %tmp9 to i32
  %tmp11 = mul i32 %tmp10, 8
  %tmp12 = zext i32 %tmp11 to i64
  br label %bb241

bb241:                                            ; preds = %bb241, %bb
  %lsr.iv3 = phi i64 [ %lsr.iv.next4, %bb241 ], [ %tmp12, %bb ]
  %lsr.iv1 = phi i32 [ %lsr.iv.next2, %bb241 ], [ 0, %bb ]
  %lsr.iv.next2 = add nuw nsw i32 %lsr.iv1, 1
  %lsr.iv.next4 = add i64 %lsr.iv3, 32
  %exitcond = icmp eq i32 %lsr.iv.next2, 8
  br i1 %exitcond, label %.preheader.preheader, label %bb241

.preheader.preheader:                             ; preds = %bb241
  %tmp18 = lshr i32 %block8x8, 1
  br label %bb270

bb270:                                            ; preds = %bb270, %.preheader.preheader
  %lsr.iv = phi i32 [ %lsr.iv.next, %bb270 ], [ %tmp18, %.preheader.preheader ]
  %lsr.iv.next = add i32 %lsr.iv, 4
  %tmp272 = icmp slt i32 %lsr.iv.next, 100
  br i1 %tmp272, label %bb270, label %.loopexit

.loopexit:                                        ; preds = %bb270
  ret i32 0
}