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Fix a mistake in the computation of leading zeros for udiv.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50591 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-05-02 21:30:02 +00:00
parent 48e8c80e17
commit 1d9cd50677
4 changed files with 49 additions and 6 deletions
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25
test/Transforms/InstCombine/udiv-simplify-bug-1.ll Normal file
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@@ -0,0 +1,25 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis > %t1.ll
; RUN: grep udiv %t1.ll | count 3
; RUN: grep zext %t1.ll | count 3
; PR2274
; The udiv instructions shouldn't be optimized away, and the
; sext instructions should be optimized to zext.
define i64 @foo(i32 %x) nounwind {
%r = udiv i32 %x, -1
%z = sext i32 %r to i64
ret i64 %z
}
define i64 @bar(i32 %x) nounwind {
%y = lshr i32 %x, 30
%r = udiv i32 %y, 3
%z = sext i32 %r to i64
ret i64 %z
}
define i64 @qux(i32 %x, i32 %v) nounwind {
%y = lshr i32 %x, 31
%r = udiv i32 %y, %v
%z = sext i32 %r to i64
ret i64 %z
}