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Implement mulo x, 2 -> addo x, x in DAGCombiner.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131800 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-05-21 18:31:55 +00:00
parent a0962766ba
commit f55d26e788
2 changed files with 48 additions and 0 deletions
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24
test/CodeGen/X86/umul-with-overflow.ll
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@ -12,3 +12,27 @@ define i1 @a(i32 %x) zeroext nounwind {
; CHECK: movzbl %al, %eax
; CHECK: ret
}
define i32 @test2(i32 %a, i32 %b) nounwind readnone {
entry:
%tmp0 = add i32 %b, %a
%tmp1 = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %tmp0, i32 2)
%tmp2 = extractvalue { i32, i1 } %tmp1, 0
ret i32 %tmp2
; CHECK: test2:
; CHECK: addl
; CHECK-NEXT: addl
; CHECK-NEXT: ret
}
define i32 @test3(i32 %a, i32 %b) nounwind readnone {
entry:
%tmp0 = add i32 %b, %a
%tmp1 = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %tmp0, i32 4)
%tmp2 = extractvalue { i32, i1 } %tmp1, 0
ret i32 %tmp2
; CHECK: test3:
; CHECK: addl
; CHECK: mull
; CHECK-NEXT: ret
}