Fixed vector widening of binary instructions that can trap. Patch by Visa Putkinen!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106038 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/Generic/v-binop-widen.ll

@@ -0,0 +1,8 @@
+; RUN: llc -march=x86 %s
+
+%vec = type <9 x float>
+define %vec @vecdiv( %vec %p1, %vec %p2)
+{
+  %result = fdiv %vec %p1, %p2
+  ret %vec %result
+}

test/CodeGen/Generic/v-binop-widen2.ll

@@ -0,0 +1,37 @@
+; RUN: llvm-as < %s | lli
+
+%vec = type <6 x float>
+
+define %vec @vecdiv( %vec %p1, %vec %p2)
+{
+  %result = fdiv %vec %p1, %p2
+  ret %vec %result
+}
+
+@a = constant %vec < float 2.0, float 4.0, float 8.0, float 16.0, float 32.0, float 64.0 >
+@b = constant %vec < float 2.0, float 2.0, float 2.0, float 2.0, float 2.0, float 2.0 >
+
+; Expected result: < 1.0, 2.0, 4.0, ..., 2.0^(n-1) >
+; main() returns 0 if the result is expected and 1 otherwise
+define i32 @main() nounwind {
+entry:
+  %avec = load %vec* @a
+  %bvec = load %vec* @b
+
+  %res = call %vec @vecdiv(%vec %avec, %vec %bvec)
+  br label %loop
+loop:
+  %idx = phi i32 [0, %entry], [%nextInd, %looptail]
+  %expected = phi float [1.0, %entry], [%nextExpected, %looptail]
+  %elem = extractelement %vec %res, i32 %idx
+  %expcmp = fcmp oeq float %elem, %expected
+  br i1 %expcmp, label %looptail, label %return
+looptail:
+  %nextExpected = fmul float %expected, 2.0
+  %nextInd = add i32 %idx, 1
+  %cmp = icmp slt i32 %nextInd, 6
+  br i1 %cmp, label %loop, label %return
+return:
+  %retval = phi i32 [0, %looptail], [1, %loop]
+  ret i32 %retval
+}