[llvm] r354219 - [InstCombine] add tests for unsigned saturated add; NFC

Sanjay Patel via llvm-commits llvm-commits at lists.llvm.org
Sun Feb 17 07:09:41 PST 2019


Author: spatel
Date: Sun Feb 17 07:09:41 2019
New Revision: 354219

URL: http://llvm.org/viewvc/llvm-project?rev=354219&view=rev
Log:
[InstCombine] add tests for unsigned saturated add; NFC

We're missing IR canonicalizations for this op as shown in D51929.

Modified:
    llvm/trunk/test/Transforms/InstCombine/saturating-add-sub.ll

Modified: llvm/trunk/test/Transforms/InstCombine/saturating-add-sub.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/saturating-add-sub.ll?rev=354219&r1=354218&r2=354219&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/saturating-add-sub.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/saturating-add-sub.ll Sun Feb 17 07:09:41 2019
@@ -639,6 +639,38 @@ define <2 x i8> @test_vector_ssub_neg_nn
 
 ; Raw IR tests
 
+define i32 @uadd_sat(i32 %x, i32 %y) {
+; CHECK-LABEL: @uadd_sat(
+; CHECK-NEXT:    [[NOTX:%.*]] = xor i32 [[X:%.*]], -1
+; CHECK-NEXT:    [[A:%.*]] = add i32 [[Y:%.*]], [[X]]
+; CHECK-NEXT:    [[C:%.*]] = icmp ult i32 [[NOTX]], [[Y]]
+; CHECK-NEXT:    [[R:%.*]] = select i1 [[C]], i32 -1, i32 [[A]]
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %notx = xor i32 %x, -1
+  %a = add i32 %y, %x
+  %c = icmp ult i32 %notx, %y
+  %r = select i1 %c, i32 -1, i32 %a
+  ret i32 %r
+}
+
+define i32 @uadd_sat_commute1(i32 %xp, i32 %y) {
+; CHECK-LABEL: @uadd_sat_commute1(
+; CHECK-NEXT:    [[X:%.*]] = urem i32 42, [[XP:%.*]]
+; CHECK-NEXT:    [[NOTX:%.*]] = xor i32 [[X]], -1
+; CHECK-NEXT:    [[A:%.*]] = add i32 [[X]], [[Y:%.*]]
+; CHECK-NEXT:    [[C:%.*]] = icmp ult i32 [[NOTX]], [[Y]]
+; CHECK-NEXT:    [[R:%.*]] = select i1 [[C]], i32 -1, i32 [[A]]
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %x = urem i32 42, %xp ; thwart complexity-based-canonicalization
+  %notx = xor i32 %x, -1
+  %a = add i32 %x, %y
+  %c = icmp ult i32 %notx, %y
+  %r = select i1 %c, i32 -1, i32 %a
+  ret i32 %r
+}
+
 define i32 @uadd_sat_constant(i32 %x) {
 ; CHECK-LABEL: @uadd_sat_constant(
 ; CHECK-NEXT:    [[A:%.*]] = add i32 [[X:%.*]], 42




More information about the llvm-commits mailing list