for (auto OV : I->operand_values()) {
if (isOutOfScope(OV))
continue;
+ // First order recurrence Phi's should typically be considered
+ // non-uniform.
+ auto *OP = dyn_cast<PHINode>(OV);
+ if (OP && Legal->isFirstOrderRecurrence(OP))
+ continue;
+ // If all the users of the operand are uniform, then add the
+ // operand into the uniform worklist.
auto *OI = cast<Instruction>(OV);
if (llvm::all_of(OI->users(), [&](User *U) -> bool {
auto *J = cast<Instruction>(U);
ret i64 %retval
}
+; CHECK-LABEL: PR38786
+; Check that first order recurrence phis (%phi32 and %phi64) are not uniform.
+; CHECK-NOT: LV: Found uniform instruction: %phi
+define void @PR38786(double* %y, double* %x, i64 %n) {
+entry:
+ br label %for.body
+
+for.body:
+ %phi32 = phi i32 [ 0, %entry ], [ %i32next, %for.body ]
+ %phi64 = phi i64 [ 0, %entry ], [ %i64next, %for.body ]
+ %i32next = add i32 %phi32, 1
+ %i64next = zext i32 %i32next to i64
+ %xip = getelementptr inbounds double, double* %x, i64 %i64next
+ %yip = getelementptr inbounds double, double* %y, i64 %phi64
+ %xi = load double, double* %xip, align 8
+ store double %xi, double* %yip, align 8
+ %cmp = icmp slt i64 %i64next, %n
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end:
+ ret void
+}