[llvm] 59855b9 - [GVN] Add additional assume tests (NFC)

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2020-09-17T21:34:43+02:00
New Revision: 59855b9d3bacc4321e3dd22ccf09bd9d177fdb6f

URL: https://github.com/llvm/llvm-project/commit/59855b9d3bacc4321e3dd22ccf09bd9d177fdb6f
DIFF: https://github.com/llvm/llvm-project/commit/59855b9d3bacc4321e3dd22ccf09bd9d177fdb6f.diff

LOG: [GVN] Add additional assume tests (NFC)

The other assume tests seem to be dealing with equalities in
particular. Test implication for the condition itself, especially
the negated case from PR47496.

Added: 
    llvm/test/Transforms/GVN/assume.ll

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/GVN/assume.ll b/llvm/test/Transforms/GVN/assume.ll
new file mode 100644
index 000000000000..206fbbb8c390
--- /dev/null
+++ b/llvm/test/Transforms/GVN/assume.ll
@@ -0,0 +1,44 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -gvn -S | FileCheck %s
+
+declare void @llvm.assume(i1)
+declare void @use(i1)
+
+define void @assume_arg(i1 %x) {
+; CHECK-LABEL: @assume_arg(
+; CHECK-NEXT:    call void @llvm.assume(i1 [[X:%.*]])
+; CHECK-NEXT:    call void @use(i1 true)
+; CHECK-NEXT:    ret void
+;
+  call void @llvm.assume(i1 %x)
+  call void @use(i1 %x)
+  ret void
+}
+
+define void @assume_not_arg(i1 %x) {
+; CHECK-LABEL: @assume_not_arg(
+; CHECK-NEXT:    [[XOR:%.*]] = xor i1 [[X:%.*]], true
+; CHECK-NEXT:    call void @llvm.assume(i1 [[XOR]])
+; CHECK-NEXT:    call void @use(i1 [[X]])
+; CHECK-NEXT:    ret void
+;
+  %xor = xor i1 %x, true
+  call void @llvm.assume(i1 %xor)
+  call void @use(i1 %x)
+  ret void
+}
+
+define void @pr47496(i8 %x) {
+; CHECK-LABEL: @pr47496(
+; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i8 [[X:%.*]], 0
+; CHECK-NEXT:    [[XOR:%.*]] = xor i1 [[CMP]], true
+; CHECK-NEXT:    call void @llvm.assume(i1 [[XOR]])
+; CHECK-NEXT:    call void @use(i1 [[CMP]])
+; CHECK-NEXT:    ret void
+;
+  %cmp = icmp slt i8 %x, 0
+  %xor = xor i1 %cmp, true
+  call void @llvm.assume(i1 %xor)
+  call void @use(i1 %cmp)
+  ret void
+}