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llvm-project/clang/test/CodeGenCXX/discard-name-values.cpp

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Emit label names according to -discard-value-names. Summary: Previously, Clang only emitted label names in assert builds. However there is a CC1 option -discard-value-names that should have been used to control emission instead. This patch removes the NDEBUG preprocessor block and instead allows LLVM to handle removing the names in accordance with the option. Reviewers: erichkeane, aaron.ballman, majnemer Reviewed By: aaron.ballman Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D42829 llvm-svn: 324127
2018-02-03 03:58:34 +08:00
// RUN: %clang_cc1 -emit-llvm -triple=armv7-apple-darwin -std=c++11 %s -o - -O1 \
// RUN: | FileCheck %s
// RUN: %clang_cc1 -emit-llvm -triple=armv7-apple-darwin -std=c++11 %s -o - -O1 \
// RUN: -discard-value-names | FileCheck %s --check-prefix=DISCARDVALUE
Remove compile time PreserveName in favor of a runtime cc1 -discard-value-names option Summary: This flag is enabled by default in the driver when NDEBUG is set. It is forwarded on the LLVMContext to discard all value names (but GlobalValue) for performance purpose. This an improved version of D18024 Reviewers: echristo, chandlerc Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D18127 From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 263394
2016-03-14 05:05:23 +08:00
Emit label names according to -discard-value-names. Summary: Previously, Clang only emitted label names in assert builds. However there is a CC1 option -discard-value-names that should have been used to control emission instead. This patch removes the NDEBUG preprocessor block and instead allows LLVM to handle removing the names in accordance with the option. Reviewers: erichkeane, aaron.ballman, majnemer Reviewed By: aaron.ballman Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D42829 llvm-svn: 324127
2018-02-03 03:58:34 +08:00
extern "C" void branch();
bool test(bool pred) {
// DISCARDVALUE: br i1 %0, label %2, label %3
// CHECK: br i1 %pred, label %if.then, label %if.end
if (pred) {
IR: Support parsing numeric block ids, and emit them in textual output. Just as as llvm IR supports explicitly specifying numeric value ids for instructions, and emits them by default in textual output, now do the same for blocks. This is a slightly incompatible change in the textual IR format. Previously, llvm would parse numeric labels as string names. E.g. define void @f() { br label %"55" 55: ret void } defined a label *named* "55", even without needing to be quoted, while the reference required quoting. Now, if you intend a block label which looks like a value number to be a name, you must quote it in the definition too (e.g. `"55":`). Previously, llvm would print nameless blocks only as a comment, and would omit it if there was no predecessor. This could cause confusion for readers of the IR, just as unnamed instructions did prior to the addition of "%5 = " syntax, back in 2008 (PR2480). Now, it will always print a label for an unnamed block, with the exception of the entry block. (IMO it may be better to print it for the entry-block as well. However, that requires updating many more tests.) Thus, the following is supported, and is the canonical printing: define i32 @f(i32, i32) { %3 = add i32 %0, %1 br label %4 4: ret i32 %3 } New test cases covering this behavior are added, and other tests updated as required. Differential Revision: https://reviews.llvm.org/D58548 llvm-svn: 356789
2019-03-23 02:27:13 +08:00
// DISCARDVALUE: 2:
Revert "Revert "As a follow-up to my initial mail to llvm-dev here's a first pass at the O1 described there."" This reapplies: 8ff85ed905a7306977d07a5cd67ab4d5a56fafb4 Original commit message: As a follow-up to my initial mail to llvm-dev here's a first pass at the O1 described there. This change doesn't include any change to move from selection dag to fast isel and that will come with other numbers that should help inform that decision. There also haven't been any real debuggability studies with this pipeline yet, this is just the initial start done so that people could see it and we could start tweaking after. Test updates: Outside of the newpm tests most of the updates are coming from either optimization passes not run anymore (and without a compelling argument at the moment) that were largely used for canonicalization in clang. Original post: http://lists.llvm.org/pipermail/llvm-dev/2019-April/131494.html Tags: #llvm Differential Revision: https://reviews.llvm.org/D65410 This reverts commit c9ddb02659e3ece7a0d9d6b4dac7ceea4ae46e6d.
2019-11-27 12:28:52 +08:00
// DISCARDVALUE-NEXT: call void @branch()
Emit label names according to -discard-value-names. Summary: Previously, Clang only emitted label names in assert builds. However there is a CC1 option -discard-value-names that should have been used to control emission instead. This patch removes the NDEBUG preprocessor block and instead allows LLVM to handle removing the names in accordance with the option. Reviewers: erichkeane, aaron.ballman, majnemer Reviewed By: aaron.ballman Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D42829 llvm-svn: 324127
2018-02-03 03:58:34 +08:00
// DISCARDVALUE-NEXT: br label %3
Remove compile time PreserveName in favor of a runtime cc1 -discard-value-names option Summary: This flag is enabled by default in the driver when NDEBUG is set. It is forwarded on the LLVMContext to discard all value names (but GlobalValue) for performance purpose. This an improved version of D18024 Reviewers: echristo, chandlerc Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D18127 From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 263394
2016-03-14 05:05:23 +08:00
Emit label names according to -discard-value-names. Summary: Previously, Clang only emitted label names in assert builds. However there is a CC1 option -discard-value-names that should have been used to control emission instead. This patch removes the NDEBUG preprocessor block and instead allows LLVM to handle removing the names in accordance with the option. Reviewers: erichkeane, aaron.ballman, majnemer Reviewed By: aaron.ballman Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D42829 llvm-svn: 324127
2018-02-03 03:58:34 +08:00
// CHECK: if.then:
Revert "Revert "As a follow-up to my initial mail to llvm-dev here's a first pass at the O1 described there."" This reapplies: 8ff85ed905a7306977d07a5cd67ab4d5a56fafb4 Original commit message: As a follow-up to my initial mail to llvm-dev here's a first pass at the O1 described there. This change doesn't include any change to move from selection dag to fast isel and that will come with other numbers that should help inform that decision. There also haven't been any real debuggability studies with this pipeline yet, this is just the initial start done so that people could see it and we could start tweaking after. Test updates: Outside of the newpm tests most of the updates are coming from either optimization passes not run anymore (and without a compelling argument at the moment) that were largely used for canonicalization in clang. Original post: http://lists.llvm.org/pipermail/llvm-dev/2019-April/131494.html Tags: #llvm Differential Revision: https://reviews.llvm.org/D65410 This reverts commit c9ddb02659e3ece7a0d9d6b4dac7ceea4ae46e6d.
2019-11-27 12:28:52 +08:00
// CHECK-NEXT: call void @branch()
Emit label names according to -discard-value-names. Summary: Previously, Clang only emitted label names in assert builds. However there is a CC1 option -discard-value-names that should have been used to control emission instead. This patch removes the NDEBUG preprocessor block and instead allows LLVM to handle removing the names in accordance with the option. Reviewers: erichkeane, aaron.ballman, majnemer Reviewed By: aaron.ballman Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D42829 llvm-svn: 324127
2018-02-03 03:58:34 +08:00
// CHECK-NEXT: br label %if.end
branch();
}
Remove compile time PreserveName in favor of a runtime cc1 -discard-value-names option Summary: This flag is enabled by default in the driver when NDEBUG is set. It is forwarded on the LLVMContext to discard all value names (but GlobalValue) for performance purpose. This an improved version of D18024 Reviewers: echristo, chandlerc Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D18127 From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 263394
2016-03-14 05:05:23 +08:00
IR: Support parsing numeric block ids, and emit them in textual output. Just as as llvm IR supports explicitly specifying numeric value ids for instructions, and emits them by default in textual output, now do the same for blocks. This is a slightly incompatible change in the textual IR format. Previously, llvm would parse numeric labels as string names. E.g. define void @f() { br label %"55" 55: ret void } defined a label *named* "55", even without needing to be quoted, while the reference required quoting. Now, if you intend a block label which looks like a value number to be a name, you must quote it in the definition too (e.g. `"55":`). Previously, llvm would print nameless blocks only as a comment, and would omit it if there was no predecessor. This could cause confusion for readers of the IR, just as unnamed instructions did prior to the addition of "%5 = " syntax, back in 2008 (PR2480). Now, it will always print a label for an unnamed block, with the exception of the entry block. (IMO it may be better to print it for the entry-block as well. However, that requires updating many more tests.) Thus, the following is supported, and is the canonical printing: define i32 @f(i32, i32) { %3 = add i32 %0, %1 br label %4 4: ret i32 %3 } New test cases covering this behavior are added, and other tests updated as required. Differential Revision: https://reviews.llvm.org/D58548 llvm-svn: 356789
2019-03-23 02:27:13 +08:00
// DISCARDVALUE: 3:
Emit label names according to -discard-value-names. Summary: Previously, Clang only emitted label names in assert builds. However there is a CC1 option -discard-value-names that should have been used to control emission instead. This patch removes the NDEBUG preprocessor block and instead allows LLVM to handle removing the names in accordance with the option. Reviewers: erichkeane, aaron.ballman, majnemer Reviewed By: aaron.ballman Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D42829 llvm-svn: 324127
2018-02-03 03:58:34 +08:00
// DISCARDVALUE-NEXT: ret i1 %0
// CHECK: if.end:
// CHECK-NEXT: ret i1 %pred
return pred;
}