[PATCH] D148321: [ConstraintElimination] Add tests to check for transfering facts from sgt to ugt.

[Zain Jaffal via Phabricator via llvm-commits]

zjaffal created this revision.
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If we have a >s b and we know that b >s 0 then we also can infer that a >u b.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148321

Files:
  llvm/test/Transforms/ConstraintElimination/transfer-signed-facts-to-unsigned.ll


Index: llvm/test/Transforms/ConstraintElimination/transfer-signed-facts-to-unsigned.ll
===================================================================
--- llvm/test/Transforms/ConstraintElimination/transfer-signed-facts-to-unsigned.ll
+++ llvm/test/Transforms/ConstraintElimination/transfer-signed-facts-to-unsigned.ll
@@ -596,6 +596,74 @@
   ret i1 %res.2
 }
 
+define i1 @sgt_to_ugt(i8 %a) {
+; CHECK-LABEL: @sgt_to_ugt(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i8 [[A:%.*]], 2
+; CHECK-NEXT:    call void @llvm.assume(i1 [[CMP]])
+; CHECK-NEXT:    [[T_1:%.*]] = icmp ugt i8 [[A]], 2
+; CHECK-NEXT:    ret i1 [[T_1]]
+;
+entry:
+  %cmp = icmp sgt i8 %a, 2
+  call void @llvm.assume(i1 %cmp)
+  %t.1 = icmp ugt i8 %a, 2
+  ret i1 %t.1
+}
+
+define i1 @sgt_to_ugt_var(i8 %a, i8 %b) {
+; CHECK-LABEL: @sgt_to_ugt_var(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i8 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[CMP_2:%.*]] = icmp sgt i8 [[B]], 0
+; CHECK-NEXT:    call void @llvm.assume(i1 [[CMP]])
+; CHECK-NEXT:    call void @llvm.assume(i1 [[CMP_2]])
+; CHECK-NEXT:    [[T_1:%.*]] = icmp ugt i8 [[A]], [[B]]
+; CHECK-NEXT:    ret i1 [[T_1]]
+;
+entry:
+  %cmp = icmp sgt i8 %a, %b
+  %cmp.2 = icmp sgt i8 %b, 0
+  call void @llvm.assume(i1 %cmp)
+  call void @llvm.assume(i1 %cmp.2)
+  %t.1 = icmp ugt i8 %a, %b
+  ret i1 %t.1
+}
+
+define i1 @sgt_to_ugt_not(i8 %a) {
+; CHECK-LABEL: @sgt_to_ugt_not(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i8 [[A:%.*]], -1
+; CHECK-NEXT:    call void @llvm.assume(i1 [[CMP]])
+; CHECK-NEXT:    [[T_1:%.*]] = icmp ugt i8 [[A]], -1
+; CHECK-NEXT:    ret i1 [[T_1]]
+;
+entry:
+  %cmp = icmp sgt i8 %a, -1
+  call void @llvm.assume(i1 %cmp)
+  %t.1 = icmp ugt i8 %a, -1
+  ret i1 %t.1
+}
+
+define i1 @sgt_to_ugt_var_not(i8 %a, i8 %b) {
+; CHECK-LABEL: @sgt_to_ugt_var_not(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i8 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[CMP_2:%.*]] = icmp sgt i8 [[B]], -1
+; CHECK-NEXT:    call void @llvm.assume(i1 [[CMP]])
+; CHECK-NEXT:    call void @llvm.assume(i1 [[CMP_2]])
+; CHECK-NEXT:    [[T_1:%.*]] = icmp ugt i8 [[A]], [[B]]
+; CHECK-NEXT:    ret i1 [[T_1]]
+;
+entry:
+  %cmp = icmp sgt i8 %a, %b
+  %cmp.2 = icmp sgt i8 %b, -1
+  call void @llvm.assume(i1 %cmp)
+  call void @llvm.assume(i1 %cmp.2)
+  %t.1 = icmp ugt i8 %a, %b
+  ret i1 %t.1
+}
+
 define i1 @slt_first_op_known_pos(i8 %idx) {
 ; CHECK-LABEL: @slt_first_op_known_pos(
 ; CHECK-NEXT:  entry:


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