[llvm] [SandboxVec] Early return checks (PR #107465)

[via llvm-commits]

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@@ -0,0 +1,23 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -passes=sandbox-vectorizer -mtriple=x86_64-- -mattr=+avx %s -S | FileCheck %s
+
+; Check that we don't vectorize a NoImplicitFloat function.
+define void @no_implicit_float(ptr %ptr) noimplicitfloat {
+; CHECK-LABEL: define void @no_implicit_float(
+; CHECK-SAME: ptr [[PTR:%.*]]) #[[ATTR0:[0-9]+]] {
+; CHECK-NEXT:    [[PTR0:%.*]] = getelementptr double, ptr [[PTR]], i32 0
+; CHECK-NEXT:    [[PTR1:%.*]] = getelementptr double, ptr [[PTR]], i32 1
+; CHECK-NEXT:    [[LD0:%.*]] = load double, ptr [[PTR0]], align 8
+; CHECK-NEXT:    [[LD1:%.*]] = load double, ptr [[PTR1]], align 8
+; CHECK-NEXT:    store double [[LD0]], ptr [[PTR0]], align 8
+; CHECK-NEXT:    store double [[LD1]], ptr [[PTR1]], align 8
+; CHECK-NEXT:    ret void
+;
+  %ptr0 = getelementptr double, ptr %ptr, i32 0
+  %ptr1 = getelementptr double, ptr %ptr, i32 1
+  %ld0 = load double, ptr %ptr0
+  %ld1 = load double, ptr %ptr1
+  store double %ld0, ptr %ptr0
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vporpo wrote:

We could use a different pointer, but it shouldn't matter too much. The vectorizer won't clean it up.

https://github.com/llvm/llvm-project/pull/107465