Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/test/Transforms/InstCombine/memcpy-1.ll

@@ -0,0 +1,28 @@
+; Test that the memcpy library call simplifier works correctly.
+;
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+
+declare i8* @memcpy(i8*, i8*, i32)
+
+; Check memcpy(mem1, mem2, size) -> llvm.memcpy(mem1, mem2, size, 1).
+
+define i8* @test_simplify1(i8* %mem1, i8* %mem2, i32 %size) {
+; CHECK-LABEL: @test_simplify1(
+; CHECK-NEXT:    call void @llvm.memcpy.p0i8.p0i8.i32(i8* %mem1, i8* %mem2, i32 %size, i32 1, i1 false)
+; CHECK-NEXT:    ret i8* %mem1
+;
+  %ret = call i8* @memcpy(i8* %mem1, i8* %mem2, i32 %size)
+  ret i8* %ret
+}
+
+; Verify that the strictfp attr doesn't block this optimization.
+
+define i8* @test_simplify2(i8* %mem1, i8* %mem2, i32 %size) {
+; CHECK-LABEL: @test_simplify2(
+  %ret = call i8* @memcpy(i8* %mem1, i8* %mem2, i32 %size) strictfp
+; CHECK: call void @llvm.memcpy
+  ret i8* %ret
+; CHECK: ret i8* %mem1
+}