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Fix optimization. %x = sub %x, %y does not imply that %y is zero.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42157 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2007-09-20 00:48:36 +00:00
parent 17207ddf38
commit e29578afd5
2 changed files with 103 additions and 1 deletions
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2
lib/Transforms/Scalar/PredicateSimplifier.cpp
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@ -2001,7 +2001,7 @@ namespace {
if (!isRelatedBy(Known, Zero, ICmpInst::ICMP_NE)) break;
// otherwise, fall-through.
case Instruction::Sub:
if (Unknown == Op1) break;
if (Unknown == Op0) break;
// otherwise, fall-through.
case Instruction::Xor:
case Instruction::Add:

102
test/Transforms/PredicateSimplifier/2007-09-19-Subtract.ll Normal file
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@ -0,0 +1,102 @@
; RUN: llvm-as < %s | opt -predsimplify | llvm-dis | grep -v unreachable
; PR1683
@.str = internal constant [13 x i8] c"c36174a.adb\00\00" ; <[13 x i8]*> [#uses=1]
define void @_ada_c36174a() {
entry:
%tmp3 = call i8* @llvm.stacksave( ) ; <i8*> [#uses=1]
%tmp4 = invoke i32 @report__ident_int( i32 6 )
to label %invcont unwind label %entry.lpad_crit_edge ; <i32> [#uses=7]
entry.lpad_crit_edge: ; preds = %entry
br label %lpad
invcont: ; preds = %entry
%tmp6 = icmp slt i32 %tmp4, 1 ; <i1> [#uses=1]
br i1 %tmp6, label %bb, label %bb9
bb: ; preds = %invcont
invoke void @__gnat_rcheck_07( i8* getelementptr ([13 x i8]* @.str, i32 0, i32 0), i32 10 )
to label %invcont8 unwind label %bb.lpad_crit_edge
bb.lpad_crit_edge: ; preds = %bb
br label %lpad
invcont8: ; preds = %bb
unreachable
bb9: ; preds = %invcont
%tmp51 = add i32 %tmp4, 6 ; <i32> [#uses=2]
%tmp56 = icmp sgt i32 %tmp4, %tmp51 ; <i1> [#uses=1]
br i1 %tmp56, label %bb9.bb76_crit_edge, label %bb9.bb61_crit_edge
bb9.bb61_crit_edge: ; preds = %bb9
br label %bb61
bb9.bb76_crit_edge: ; preds = %bb9
br label %bb76
bb61: ; preds = %bb73, %bb9.bb61_crit_edge
%J4b.0 = phi i32 [ %tmp75, %bb73 ], [ %tmp4, %bb9.bb61_crit_edge ] ; <i32> [#uses=2]
%tmp70 = icmp eq i32 %tmp51, %J4b.0 ; <i1> [#uses=1]
br i1 %tmp70, label %bb61.bb76_crit_edge, label %bb73
bb61.bb76_crit_edge: ; preds = %bb61
br label %bb76
bb73: ; preds = %bb61
%tmp75 = add i32 %J4b.0, 1 ; <i32> [#uses=1]
br label %bb61
bb76: ; preds = %bb61.bb76_crit_edge, %bb9.bb76_crit_edge
%tmp78 = icmp ne i32 %tmp4, 6 ; <i1> [#uses=1]
%tmp81 = add i32 %tmp4, 6 ; <i32> [#uses=1]
%tmp8182 = sext i32 %tmp81 to i64 ; <i64> [#uses=1]
%tmp8384 = sext i32 %tmp4 to i64 ; <i64> [#uses=1]
%tmp85 = sub i64 %tmp8182, %tmp8384 ; <i64> [#uses=1]
%tmp86 = icmp ne i64 %tmp85, 6 ; <i1> [#uses=1]
%tmp90 = or i1 %tmp78, %tmp86 ; <i1> [#uses=1]
br i1 %tmp90, label %bb93, label %bb76.bb99_crit_edge
bb76.bb99_crit_edge: ; preds = %bb76
br label %bb99
bb93: ; preds = %bb76
invoke void @abort( )
to label %bb93.bb99_crit_edge unwind label %bb93.lpad_crit_edge
bb93.lpad_crit_edge: ; preds = %bb93
br label %lpad
bb93.bb99_crit_edge: ; preds = %bb93
br label %bb99
bb99: ; preds = %bb93.bb99_crit_edge, %bb76.bb99_crit_edge
ret void
lpad: ; preds = %bb93.lpad_crit_edge, %bb.lpad_crit_edge, %entry.lpad_crit_edge
%eh_ptr = call i8* @llvm.eh.exception( ) ; <i8*> [#uses=2]
%eh_select102 = call i32 (i8*, i8*, ...)* @llvm.eh.selector.i32( i8* %eh_ptr, i8* bitcast (i32 (...)* @__gnat_eh_personality to i8*), i32 0 ) ; <i32> [#uses=0]
call void @llvm.stackrestore( i8* %tmp3 )
call i32 (...)* @_Unwind_Resume( i8* %eh_ptr ) ; <i32>:0 [#uses=0]
unreachable
}
declare i8* @llvm.stacksave()
declare i32 @report__ident_int(i32)
declare void @__gnat_rcheck_07(i8*, i32)
declare void @abort()
declare i8* @llvm.eh.exception()
declare i32 @llvm.eh.selector.i32(i8*, i8*, ...)
declare i32 @__gnat_eh_personality(...)
declare i32 @_Unwind_Resume(...)
declare void @llvm.stackrestore(i8*)