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      1 ; RUN: llc -O0 -relocation-model=pic -disable-fp-elim < %s
      2 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
      3 target triple = "x86_64-apple-darwin10"
      4 
      5 ; This file contains functions that may crash llc -O0
      6 
      7 ; The DIV8 instruction produces results in AH and AL, but we don't want to use
      8 ; AH in 64-bit mode. The hack used must not generate copyFromReg nodes for
      9 ; aliased registers (AX and AL) - RegAllocFast does not like that.
     10 ; PR7312
     11 define i32 @div8() nounwind {
     12 entry:
     13   %0 = trunc i64 undef to i8                      ; <i8> [#uses=3]
     14   %1 = udiv i8 0, %0                              ; <i8> [#uses=1]
     15   %2 = urem i8 0, %0                              ; <i8> [#uses=1]
     16   %3 = icmp uge i8 %2, %0                         ; <i1> [#uses=1]
     17   br i1 %3, label %"40", label %"39"
     18 
     19 "39":                                             ; preds = %"36"
     20   %4 = zext i8 %1 to i32                          ; <i32> [#uses=1]
     21   %5 = mul nsw i32 %4, undef                      ; <i32> [#uses=1]
     22   %6 = add nsw i32 %5, undef                      ; <i32> [#uses=1]
     23   %7 = icmp ne i32 %6, undef                      ; <i1> [#uses=1]
     24   br i1 %7, label %"40", label %"41"
     25 
     26 "40":                                             ; preds = %"39", %"36"
     27   unreachable
     28 
     29 "41":                                             ; preds = %"39"
     30   unreachable
     31 }
     32