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PR13326: Fix a subtle edge case in the udiv -> magic multiply generator.

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This caused 6 of 65k possible 8 bit udivs to be wrong.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160058 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2012-07-11 18:31:59 +00:00
parent 79137851bf
commit 597f2950d8
2 changed files with 22 additions and 1 deletions
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21
test/CodeGen/X86/divide-by-constant.ll
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@@ -71,3 +71,24 @@ define i32 @test7(i32 %x) nounwind {
; CHECK-NOT: shrl
; CHECK: ret
}
; PR13326
define i8 @test8(i8 %x) nounwind {
%div = udiv i8 %x, 78
ret i8 %div
; CHECK: test8:
; CHECK: shrb %
; CHECK: imull $211
; CHECK: shrl $13
; CHECK: ret
}
define i8 @test9(i8 %x) nounwind {
%div = udiv i8 %x, 116
ret i8 %div
; CHECK: test9:
; CHECK: shrb $2
; CHECK: imull $71
; CHECK: shrl $11
; CHECK: ret
}