[utils] change default nameless value to "TMP"

This is effectively reverting rGbfdc2552664d to avoid test churn
while we figure out a better way forward.

We at least salvage the warning on name conflict from that patch
though.

If we change the default string again, we may want to mass update
tests at the same time. Alternatively, we could live with the poor
naming if we change -instnamer.

This also adds a test to LLVM as suggested in the post-commit
review. There's a clang test that is also affected. That seems
like a layering violation, but I have not looked at fixing that yet.

Differential Revision: https://reviews.llvm.org/D80584

clang/test/utils/update_cc_test_checks/Inputs/mangled_names.c.expected

@@ -8,10 +8,10 @@
 // CHECK-NEXT:    [[B_ADDR:%.*]] = alloca i32, align 4
 // CHECK-NEXT:    store i64 [[A:%.*]], i64* [[A_ADDR]], align 8
 // CHECK-NEXT:    store i32 [[B:%.*]], i32* [[B_ADDR]], align 4
-// CHECK-NEXT:    [[NAMELESS0:%.*]] = load i64, i64* [[A_ADDR]], align 8
-// CHECK-NEXT:    [[NAMELESS1:%.*]] = load i32, i32* [[B_ADDR]], align 4
-// CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[NAMELESS1]] to i64
-// CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[NAMELESS0]], [[CONV]]
+// CHECK-NEXT:    [[TMP0:%.*]] = load i64, i64* [[A_ADDR]], align 8
+// CHECK-NEXT:    [[TMP1:%.*]] = load i32, i32* [[B_ADDR]], align 4
+// CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[TMP1]] to i64
+// CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[TMP0]], [[CONV]]
 // CHECK-NEXT:    ret i64 [[ADD]]
 //
 long test(long a, int b) {
@@ -27,12 +27,12 @@ long test(long a, int b) {
 // CHECK-NEXT:    store i64 [[A:%.*]], i64* [[A_ADDR]], align 8
 // CHECK-NEXT:    store i32 [[B:%.*]], i32* [[B_ADDR]], align 4
 // CHECK-NEXT:    store i32 [[C:%.*]], i32* [[C_ADDR]], align 4
-// CHECK-NEXT:    [[NAMELESS0:%.*]] = load i64, i64* [[A_ADDR]], align 8
-// CHECK-NEXT:    [[NAMELESS1:%.*]] = load i32, i32* [[B_ADDR]], align 4
-// CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[NAMELESS1]] to i64
-// CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[NAMELESS0]], [[CONV]]
-// CHECK-NEXT:    [[NAMELESS2:%.*]] = load i32, i32* [[C_ADDR]], align 4
-// CHECK-NEXT:    [[CONV1:%.*]] = sext i32 [[NAMELESS2]] to i64
+// CHECK-NEXT:    [[TMP0:%.*]] = load i64, i64* [[A_ADDR]], align 8
+// CHECK-NEXT:    [[TMP1:%.*]] = load i32, i32* [[B_ADDR]], align 4
+// CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[TMP1]] to i64
+// CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[TMP0]], [[CONV]]
+// CHECK-NEXT:    [[TMP2:%.*]] = load i32, i32* [[C_ADDR]], align 4
+// CHECK-NEXT:    [[CONV1:%.*]] = sext i32 [[TMP2]] to i64
 // CHECK-NEXT:    [[ADD2:%.*]] = add nsw i64 [[ADD]], [[CONV1]]
 // CHECK-NEXT:    ret i64 [[ADD2]]
 //

clang/test/utils/update_cc_test_checks/Inputs/mangled_names.c.funcsig.expected

@@ -9,10 +9,10 @@
 // CHECK-NEXT:    [[B_ADDR:%.*]] = alloca i32, align 4
 // CHECK-NEXT:    store i64 [[A]], i64* [[A_ADDR]], align 8
 // CHECK-NEXT:    store i32 [[B]], i32* [[B_ADDR]], align 4
-// CHECK-NEXT:    [[NAMELESS0:%.*]] = load i64, i64* [[A_ADDR]], align 8
-// CHECK-NEXT:    [[NAMELESS1:%.*]] = load i32, i32* [[B_ADDR]], align 4
-// CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[NAMELESS1]] to i64
-// CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[NAMELESS0]], [[CONV]]
+// CHECK-NEXT:    [[TMP0:%.*]] = load i64, i64* [[A_ADDR]], align 8
+// CHECK-NEXT:    [[TMP1:%.*]] = load i32, i32* [[B_ADDR]], align 4
+// CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[TMP1]] to i64
+// CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[TMP0]], [[CONV]]
 // CHECK-NEXT:    ret i64 [[ADD]]
 //
 long test(long a, int b) {
@@ -29,12 +29,12 @@ long test(long a, int b) {
 // CHECK-NEXT:    store i64 [[A]], i64* [[A_ADDR]], align 8
 // CHECK-NEXT:    store i32 [[B]], i32* [[B_ADDR]], align 4
 // CHECK-NEXT:    store i32 [[C]], i32* [[C_ADDR]], align 4
-// CHECK-NEXT:    [[NAMELESS0:%.*]] = load i64, i64* [[A_ADDR]], align 8
-// CHECK-NEXT:    [[NAMELESS1:%.*]] = load i32, i32* [[B_ADDR]], align 4
-// CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[NAMELESS1]] to i64
-// CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[NAMELESS0]], [[CONV]]
-// CHECK-NEXT:    [[NAMELESS2:%.*]] = load i32, i32* [[C_ADDR]], align 4
-// CHECK-NEXT:    [[CONV1:%.*]] = sext i32 [[NAMELESS2]] to i64
+// CHECK-NEXT:    [[TMP0:%.*]] = load i64, i64* [[A_ADDR]], align 8
+// CHECK-NEXT:    [[TMP1:%.*]] = load i32, i32* [[B_ADDR]], align 4
+// CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[TMP1]] to i64
+// CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[TMP0]], [[CONV]]
+// CHECK-NEXT:    [[TMP2:%.*]] = load i32, i32* [[C_ADDR]], align 4
+// CHECK-NEXT:    [[CONV1:%.*]] = sext i32 [[TMP2]] to i64
 // CHECK-NEXT:    [[ADD2:%.*]] = add nsw i64 [[ADD]], [[CONV1]]
 // CHECK-NEXT:    ret i64 [[ADD2]]
 //

llvm/test/tools/UpdateTestChecks/update_test_checks/Inputs/basic.ll

@@ -1,4 +1,4 @@
-; Example input for update_llc_test_checks (taken from test/Transforms/InstSimplify/add.ll)
+; Example input for update_test_checks (taken from test/Transforms/InstSimplify/add.ll)
 ; RUN: opt < %s -instsimplify -S | FileCheck %s
 
 define i32 @common_sub_operand(i32 %X, i32 %Y) {
@@ -47,3 +47,12 @@ define <2 x i8> @knownnegation_commute_vec(<2 x i8> %x, <2 x i8> %y) {
   %r = add <2 x i8> %yx, %xy
   ret <2 x i8> %r
 }
+
+define i32 @nameless_value(i32 %X) {
+; CHECK-LABEL: @nameless_value(
+; CHECK-NEXT:    [[TMP1:%.*]] = sub i32 42, [[X:%.*]]
+; CHECK-NEXT:    ret i32 [[TMP1]]
+;
+  %1 = sub i32 42, %X
+  ret i32 %1
+}

llvm/test/tools/UpdateTestChecks/update_test_checks/Inputs/basic.ll.expected

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; Example input for update_llc_test_checks (taken from test/Transforms/InstSimplify/add.ll)
+; Example input for update_test_checks (taken from test/Transforms/InstSimplify/add.ll)
 ; RUN: opt < %s -instsimplify -S | FileCheck %s
 
 define i32 @common_sub_operand(i32 %X, i32 %Y) {
@@ -48,3 +48,12 @@ define <2 x i8> @knownnegation_commute_vec(<2 x i8> %x, <2 x i8> %y) {
   %r = add <2 x i8> %yx, %xy
   ret <2 x i8> %r
 }
+
+define i32 @nameless_value(i32 %X) {
+; CHECK-LABEL: @nameless_value(
+; CHECK-NEXT:    [[TMP1:%.*]] = sub i32 42, [[X:%.*]]
+; CHECK-NEXT:    ret i32 [[TMP1]]
+;
+  %1 = sub i32 42, %X
+  ret i32 %1
+}

llvm/test/tools/UpdateTestChecks/update_test_checks/Inputs/basic.ll.funcsig.expected

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature
-; Example input for update_llc_test_checks (taken from test/Transforms/InstSimplify/add.ll)
+; Example input for update_test_checks (taken from test/Transforms/InstSimplify/add.ll)
 ; RUN: opt < %s -instsimplify -S | FileCheck %s
 
 define i32 @common_sub_operand(i32 %X, i32 %Y) {
@@ -53,3 +53,13 @@ define <2 x i8> @knownnegation_commute_vec(<2 x i8> %x, <2 x i8> %y) {
   %r = add <2 x i8> %yx, %xy
   ret <2 x i8> %r
 }
+
+define i32 @nameless_value(i32 %X) {
+; CHECK-LABEL: define {{[^@]+}}@nameless_value
+; CHECK-SAME: (i32 [[X:%.*]])
+; CHECK-NEXT:    [[TMP1:%.*]] = sub i32 42, [[X]]
+; CHECK-NEXT:    ret i32 [[TMP1]]
+;
+  %1 = sub i32 42, %X
+  ret i32 %1
+}

llvm/utils/UpdateTestChecks/common.py

@@ -218,7 +218,7 @@ SCRUB_IR_COMMENT_RE = re.compile(r'\s*;.*')
 # spaces, commas, paren, or end of the string
 IR_VALUE_RE = re.compile(r'(\s+)%([\w.-]+?)([,\s\(\)]|\Z)')
 
-NAMELESS_PREFIX = "NAMELESS"
+NAMELESS_PREFIX = "TMP"
 
 # Create a FileCheck variable name based on an IR name.
 def get_value_name(var):