fix PR6761, a miscompilation due to the fp->int IV conversion

stuff.  More bugs remain though.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100282 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp
index da99890..70be671 100644 (file)
--- a/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -709,9 +709,9 @@ void IndVarSimplify::HandleFloatingPointIV(Loop *L, PHINode *PN) {
   case CmpInst::FCMP_OGE:
   case CmpInst::FCMP_UGE: NewPred = CmpInst::ICMP_SGE; break;
   case CmpInst::FCMP_OLT:
-  case CmpInst::FCMP_ULT: NewPred = CmpInst::ICMP_ULT; break;
+  case CmpInst::FCMP_ULT: NewPred = CmpInst::ICMP_SLT; break;
   case CmpInst::FCMP_OLE:
-  case CmpInst::FCMP_ULE: NewPred = CmpInst::ICMP_ULE; break;
+  case CmpInst::FCMP_ULE: NewPred = CmpInst::ICMP_SLE; break;
   }
 
   const IntegerType *Int32Ty = Type::getInt32Ty(PN->getContext());

diff --git a/test/Transforms/IndVarSimplify/floating-point-iv.ll b/test/Transforms/IndVarSimplify/floating-point-iv.ll
index 8d75846..daeeaad 100644 (file)
--- a/test/Transforms/IndVarSimplify/floating-point-iv.ll
+++ b/test/Transforms/IndVarSimplify/floating-point-iv.ll
@@ -41,10 +41,10 @@ entry:
        br label %bb
 
 bb:            ; preds = %bb, %entry
-       %x.0.reg2mem.0 = phi double [ 0.000000e+00, %entry ], [ %1, %bb ]               ; <double> [#uses=2]
-       %0 = tail call i32 @foo(double %x.0.reg2mem.0) nounwind         ; <i32> [#uses=0]
-       %1 = fadd double %x.0.reg2mem.0, 1.000000e+00           ; <double> [#uses=2]
-       %2 = fcmp olt double %1, -1.000000e+00          ; <i1> [#uses=1]
+       %x.0.reg2mem.0 = phi double [ 0.000000e+00, %entry ], [ %1, %bb ]
+       %0 = tail call i32 @foo(double %x.0.reg2mem.0) nounwind
+       %1 = fadd double %x.0.reg2mem.0, 1.000000e+00
+       %2 = fcmp olt double %1, -1.000000e+00
        br i1 %2, label %bb, label %return
 
 return:                ; preds = %bb
@@ -70,4 +70,23 @@ return:              ; preds = %bb
 ; CHECK: icmp
 }
 
+; PR6761
+define void @test5() nounwind {
+; <label>:0
+  br label %1
+
+; <label>:1                                       ; preds = %1, %0
+  %2 = phi double [ 9.000000e+00, %0 ], [ %4, %1 ] ; <double> [#uses=1]
+  %3 = tail call i32 @foo(double 0.0)              ; <i32> [#uses=0]
+  %4 = fadd double %2, -1.000000e+00              ; <double> [#uses=2]
+  %5 = fcmp ult double %4, 0.000000e+00           ; <i1> [#uses=1]
+  br i1 %5, label %exit, label %1
+
+exit:
+  ret void
+  
+; CHECK: @test5
+; CHECK: icmp eq i32 {{.*}}, 10
+; CHECK-NEXT: br i1
+}