llvm-project/llvm/test/CodeGen/X86/2010-05-03-CoalescerSubRegClobber.ll

; RUN: llc < %s -mcpu=generic | FileCheck %s
; PR6941
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"
target triple = "x86_64-apple-darwin10.0.0"

define i32 @snd_xbytes(i32 %v, i32 %from, i32 %to) nounwind readnone ssp {
entry:
  %cmp19 = icmp eq i32 %to, 0                     ; <i1> [#uses=1]
  br i1 %cmp19, label %while.end, label %while.cond

while.cond:                                       ; preds = %entry, %while.cond
  %y.021 = phi i32 [ %rem, %while.cond ], [ %to, %entry ] ; <i32> [#uses=3]
  %x.020 = phi i32 [ %y.021, %while.cond ], [ %from, %entry ] ; <i32> [#uses=1]
  %rem = urem i32 %x.020, %y.021                  ; <i32> [#uses=2]
  %cmp = icmp eq i32 %rem, 0                      ; <i1> [#uses=1]
  br i1 %cmp, label %while.end, label %while.cond

while.end:                                        ; preds = %while.cond, %entry
  %x.0.lcssa = phi i32 [ %from, %entry ], [ %y.021, %while.cond ] ; <i32> [#uses=2]
  %div = udiv i32 %from, %x.0.lcssa               ; <i32> [#uses=1]
  %div11 = udiv i32 %to, %x.0.lcssa               ; <i32> [#uses=1]
  %conv = zext i32 %v to i64                      ; <i64> [#uses=1]
  %conv14 = zext i32 %div11 to i64                ; <i64> [#uses=1]
; Verify that we don't clobber %eax after putting the imulq result in %rax
; CHECK: imulq	%r{{.}}x, %r[[RES:..]]
; CHECK-NOT: movl	{{.*}}, %e[[RES]]
; CHECK: div
  %mul = mul i64 %conv14, %conv                   ; <i64> [#uses=1]
  %conv16 = zext i32 %div to i64                  ; <i64> [#uses=1]
  %div17 = udiv i64 %mul, %conv16                 ; <i64> [#uses=1]
  %conv18 = trunc i64 %div17 to i32               ; <i32> [#uses=1]
  ret i32 %conv18
}