[EarlyCSE] Pre-commit offset-based GEP (NFC)

Author: dianqk

llvm/test/Transforms/EarlyCSE/gep.ll

@@ -0,0 +1,47 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
+; RUN: opt < %s -S -passes=early-cse -earlycse-debug-hash | FileCheck %s
+; RUN: opt < %s -S -passes='early-cse<memssa>' | FileCheck %s
+
+%T1 = type { i64, i64, i64 }
+
+declare void @use_vec(<4 x ptr>);
+
+define void @foo(ptr %a, <4 x i64> %b, i64 %i) {
+; CHECK-LABEL: define void @foo(
+; CHECK-SAME: ptr [[A:%.*]], <4 x i64> [[B:%.*]], i64 [[I:%.*]]) {
+; CHECK-NEXT:    [[S1A:%.*]] = getelementptr i8, ptr [[A]], i64 8
+; CHECK-NEXT:    [[S1C:%.*]] = getelementptr [[T1:%.*]], ptr [[A]], i64 0, i32 1
+; CHECK-NEXT:    [[N1D:%.*]] = getelementptr i8, ptr [[A]], i64 7
+; CHECK-NEXT:    [[S1E:%.*]] = getelementptr i64, ptr [[A]], i64 1
+; CHECK-NEXT:    [[S1F:%.*]] = getelementptr i32, ptr [[A]], i64 2
+; CHECK-NEXT:    [[N1G:%.*]] = getelementptr i32, ptr [[A]], i64 1
+; CHECK-NEXT:    [[N1H:%.*]] = getelementptr i8, ptr [[A]], i64 [[I]]
+; CHECK-NEXT:    [[V:%.*]] = getelementptr i64, ptr [[A]], <4 x i64> <i64 1, i64 1, i64 1, i64 1>
+; CHECK-NEXT:    call void @use_vec(<4 x ptr> [[V]])
+; CHECK-NEXT:    [[V2:%.*]] = getelementptr i64, ptr [[A]], <4 x i64> <i64 0, i64 2, i64 1, i64 1>
+; CHECK-NEXT:    call void @use_vec(<4 x ptr> [[V2]])
+; CHECK-NEXT:    ret void
+;
+  %s1a = getelementptr i8, ptr %a, i64 8
+  %s1av = load i64, ptr %s1a
+  %s1b = getelementptr inbounds i8, ptr %a, i64 8
+  %s1bv = load i64, ptr %s1b
+  %s1c = getelementptr %T1, ptr %a, i64 0, i32 1
+  %s1cv = load i64, ptr %s1c
+  %n1d = getelementptr i8, ptr %a, i64 7
+  %n1dv = load i64, ptr %n1d
+  %s1e = getelementptr i64, ptr %a, i64 1
+  %s1ev = load i64, ptr %s1e
+  %s1f = getelementptr i32, ptr %a, i64 2
+  %s1fv = load i64, ptr %s1f
+  %n1g = getelementptr i32, ptr %a, i64 1
+  %n1gv = load i64, ptr %n1g
+  %n1h = getelementptr i8, ptr %a, i64 %i
+  %n1hv = load i64, ptr %n1h
+
+  %v = getelementptr i64, ptr %a, <4 x i64> <i64 1, i64 1, i64 1, i64 1>
+  call void @use_vec(<4 x ptr> %v)
+  %v2 = getelementptr i64, ptr %a, <4 x i64> <i64 0, i64 2, i64 1, i64 1>
+  call void @use_vec(<4 x ptr> %v2)
+  ret void
+}