[llvm] 659871c - [ConstantFold] Add test for load of i8 from i1 (NFC)

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2022-04-08T16:32:51+02:00
New Revision: 659871cede9e3475c5de986ba4cace58e70f4801

URL: https://github.com/llvm/llvm-project/commit/659871cede9e3475c5de986ba4cace58e70f4801
DIFF: https://github.com/llvm/llvm-project/commit/659871cede9e3475c5de986ba4cace58e70f4801.diff

LOG: [ConstantFold] Add test for load of i8 from i1 (NFC)

Semantics here are a bit unclear, but the store-to-load forwarding
case at least should be a miscompile.

Added: 
    

Modified: 
    llvm/test/Transforms/InstCombine/load-store-forward.ll
    llvm/test/Transforms/InstSimplify/ConstProp/loads.ll

Removed: 
    


################################################################################
diff  --git a/llvm/test/Transforms/InstCombine/load-store-forward.ll b/llvm/test/Transforms/InstCombine/load-store-forward.ll
index eee47e87a1ca3..618e67ed0c8ec 100644
--- a/llvm/test/Transforms/InstCombine/load-store-forward.ll
+++ b/llvm/test/Transforms/InstCombine/load-store-forward.ll
@@ -289,3 +289,25 @@ entry:
   %2 = load <vscale x 4 x i8>, <vscale x 4 x i8>* %1, align 16
   ret <vscale x 4 x i8> %2
 }
+
+define i8 @load_i8_store_i1(i1* %a) {
+; CHECK-LABEL: @load_i8_store_i1(
+; CHECK-NEXT:    store i1 true, i1* [[A:%.*]], align 1
+; CHECK-NEXT:    ret i8 -1
+;
+  store i1 true, i1* %a
+  %a.i8 = bitcast i1* %a to i8*
+  %v = load i8, i8* %a.i8
+  ret i8 %v
+}
+
+define i1 @load_i1_store_i8(i8* %a) {
+; CHECK-LABEL: @load_i1_store_i8(
+; CHECK-NEXT:    store i8 1, i8* [[A:%.*]], align 1
+; CHECK-NEXT:    ret i1 true
+;
+  store i8 1, i8* %a
+  %a.i1 = bitcast i8* %a to i1*
+  %v = load i1, i1* %a.i1
+  ret i1 %v
+}

diff  --git a/llvm/test/Transforms/InstSimplify/ConstProp/loads.ll b/llvm/test/Transforms/InstSimplify/ConstProp/loads.ll
index 58701bf5a63b5..586a431b81c9d 100644
--- a/llvm/test/Transforms/InstSimplify/ConstProp/loads.ll
+++ b/llvm/test/Transforms/InstSimplify/ConstProp/loads.ll
@@ -402,3 +402,13 @@ define i64 addrspace(2)* @load_non_integral_ptr_from_i8_data() {
   %v = load i64 addrspace(2)*, i64 addrspace(2)** bitcast ([16 x i8]* @g_i8_data to i64 addrspace(2)**)
   ret i64 addrspace(2)* %v
 }
+
+ at g_i1 = constant i1 true
+
+define i8 @load_i8_from_i1() {
+; CHECK-LABEL: @load_i8_from_i1(
+; CHECK-NEXT:    ret i8 -1
+;
+  %v = load i8, i8* bitcast (i1* @g_i1 to i8*)
+  ret i8 %v
+}