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fix logical-select to invoke filecheck right, and fix hte instcombine

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xform it is checking to actually pass.  There is no need to match
m_SelectCst<0, -1> since instcombine canonicalizes that into not(sext).

Add matches for sext(not(x)) in addition to not(sext(x)).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95420 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-02-05 19:53:02 +00:00
parent 82ed17eb47
commit 74529826a7
2 changed files with 9 additions and 2 deletions
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7
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
View File

@ -1148,8 +1148,13 @@ static Instruction *MatchSelectFromAndOr(Value *A, Value *B,
// ((cond?-1:0)&C) | (B&(cond?0:-1)) -> cond ? C : B.
if (match(D, m_Not(m_SExt(m_Specific(Cond)))))
return SelectInst::Create(Cond, C, B);
if (match(D, m_SExt(m_Not(m_Specific(Cond)))))
return SelectInst::Create(Cond, C, B);
// ((cond?-1:0)&C) | ((cond?0:-1)&D) -> cond ? C : D.
if (match(B, m_SelectCst<0, -1>(m_Specific(Cond))))
if (match(B, m_Not(m_SExt(m_Specific(Cond)))))
return SelectInst::Create(Cond, C, D);
if (match(B, m_SExt(m_Not(m_Specific(Cond)))))
return SelectInst::Create(Cond, C, D);
return 0;
}

4
test/Transforms/InstCombine/logical-select.ll
View File

@ -1,4 +1,5 @@
; RUN: opt < %s -instcombine -S > FileCheck %s
; RUN: opt < %s -instcombine -S | FileCheck %s
define i32 @foo(i32 %a, i32 %b, i32 %c, i32 %d) nounwind {
%e = icmp slt i32 %a, %b
@ -24,6 +25,7 @@ define i32 @bar(i32 %a, i32 %b, i32 %c, i32 %d) nounwind {
; CHECK: %j = select i1 %e, i32 %c, i32 %d
; CHECK: ret i32 %j
}
define i32 @goo(i32 %a, i32 %b, i32 %c, i32 %d) nounwind {
entry:
%0 = icmp slt i32 %a, %b