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llvm-project/clang/test/CodeGen/no-junk-ftrunc.c

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[Driver, CodeGen] rename options to disable an FP cast optimization As suggested in the post-commit thread for rL331056, we should match these clang options with the established vocabulary of the corresponding sanitizer option. Also, the use of 'strict' is well-known for these kinds of knobs, and we can improve the descriptive text in the docs. So this intends to match the logic of D46135 but only change the words. Matching LLVM commit to match this spelling of the attribute to follow shortly. Differential Revision: https://reviews.llvm.org/D46236 llvm-svn: 331209
2018-05-01 02:19:03 +08:00
// RUN: %clang_cc1 -S -fno-strict-float-cast-overflow %s -emit-llvm -o - | FileCheck %s --check-prefix=NOSTRICT
[CodeGen] use saturating FP casts when compiling with "no-strict-float-cast-overflow" We got an unintended consequence of the optimizer getting smarter when compiling in a non-standard mode, and there's no good way to inhibit those optimizations at a later stage. The test is based on an example linked from D92270. We allow the "no-strict-float-cast-overflow" exception to normal C cast rules to preserve legacy code that does not expect overflowing casts from FP to int to produce UB. See D46236 for details. Differential Revision: https://reviews.llvm.org/D115804
2021-12-16 21:37:44 +08:00
// When compiling with non-standard semantics, use intrinsics to inhibit the optimizer.
[CodeGen] remove creation of FP cast function attribute This is the last cleanup step resulting from D115804 . Now that clang uses intrinsics when we're in the special FP mode, we don't need a function attribute as an indicator to the backend. The LLVM part of the change is in D115885. Differential Revision: https://reviews.llvm.org/D115886
2021-12-20 00:53:56 +08:00
// This used to require a function attribute, so we check that it is NOT here anymore.
[CodeGen] use saturating FP casts when compiling with "no-strict-float-cast-overflow" We got an unintended consequence of the optimizer getting smarter when compiling in a non-standard mode, and there's no good way to inhibit those optimizations at a later stage. The test is based on an example linked from D92270. We allow the "no-strict-float-cast-overflow" exception to normal C cast rules to preserve legacy code that does not expect overflowing casts from FP to int to produce UB. See D46236 for details. Differential Revision: https://reviews.llvm.org/D115804
2021-12-16 21:37:44 +08:00
[Driver, CodeGen] rename options to disable an FP cast optimization As suggested in the post-commit thread for rL331056, we should match these clang options with the established vocabulary of the corresponding sanitizer option. Also, the use of 'strict' is well-known for these kinds of knobs, and we can improve the descriptive text in the docs. So this intends to match the logic of D46135 but only change the words. Matching LLVM commit to match this spelling of the attribute to follow shortly. Differential Revision: https://reviews.llvm.org/D46236 llvm-svn: 331209
2018-05-01 02:19:03 +08:00
// NOSTRICT-LABEL: main
[CodeGen] use saturating FP casts when compiling with "no-strict-float-cast-overflow" We got an unintended consequence of the optimizer getting smarter when compiling in a non-standard mode, and there's no good way to inhibit those optimizations at a later stage. The test is based on an example linked from D92270. We allow the "no-strict-float-cast-overflow" exception to normal C cast rules to preserve legacy code that does not expect overflowing casts from FP to int to produce UB. See D46236 for details. Differential Revision: https://reviews.llvm.org/D115804
2021-12-16 21:37:44 +08:00
// NOSTRICT: call i32 @llvm.fptosi.sat.i32.f64
// NOSTRICT: call i32 @llvm.fptoui.sat.i32.f64
[CodeGen] remove creation of FP cast function attribute This is the last cleanup step resulting from D115804 . Now that clang uses intrinsics when we're in the special FP mode, we don't need a function attribute as an indicator to the backend. The LLVM part of the change is in D115885. Differential Revision: https://reviews.llvm.org/D115886
2021-12-20 00:53:56 +08:00
// NOSTRICT-NOT: strict-float-cast-overflow
[Driver, CodeGen] add options to enable/disable an FP cast optimization As discussed in the post-commit thread for: rL330437 ( http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20180423/545906.html ) We need a way to opt-out of a float-to-int-to-float cast optimization because too much existing code relies on the platform-specific undefined result of those casts when the float-to-int overflows. The LLVM changes associated with adding this function attribute are here: rL330947 rL330950 rL330951 Also as suggested, I changed the LLVM doc to mention the specific sanitizer flag that catches this problem: rL330958 Differential Revision: https://reviews.llvm.org/D46135 llvm-svn: 331041
2018-04-27 22:22:48 +08:00
// The workaround attribute is not applied by default.
[Driver] Migrate some -f/-fno options to use OptInFFlag and OptOutFFlag
2020-06-05 10:28:54 +08:00
// RUN: %clang_cc1 -S %s -emit-llvm -o - | FileCheck %s --check-prefix=STRICT
[Driver, CodeGen] rename options to disable an FP cast optimization As suggested in the post-commit thread for rL331056, we should match these clang options with the established vocabulary of the corresponding sanitizer option. Also, the use of 'strict' is well-known for these kinds of knobs, and we can improve the descriptive text in the docs. So this intends to match the logic of D46135 but only change the words. Matching LLVM commit to match this spelling of the attribute to follow shortly. Differential Revision: https://reviews.llvm.org/D46236 llvm-svn: 331209
2018-05-01 02:19:03 +08:00
// STRICT-LABEL: main
[CodeGen] use saturating FP casts when compiling with "no-strict-float-cast-overflow" We got an unintended consequence of the optimizer getting smarter when compiling in a non-standard mode, and there's no good way to inhibit those optimizations at a later stage. The test is based on an example linked from D92270. We allow the "no-strict-float-cast-overflow" exception to normal C cast rules to preserve legacy code that does not expect overflowing casts from FP to int to produce UB. See D46236 for details. Differential Revision: https://reviews.llvm.org/D115804
2021-12-16 21:37:44 +08:00
// STRICT: = fptosi
// STRICT: = fptoui
[Driver, CodeGen] rename options to disable an FP cast optimization As suggested in the post-commit thread for rL331056, we should match these clang options with the established vocabulary of the corresponding sanitizer option. Also, the use of 'strict' is well-known for these kinds of knobs, and we can improve the descriptive text in the docs. So this intends to match the logic of D46135 but only change the words. Matching LLVM commit to match this spelling of the attribute to follow shortly. Differential Revision: https://reviews.llvm.org/D46236 llvm-svn: 331209
2018-05-01 02:19:03 +08:00
// STRICT-NOT: strict-float-cast-overflow
[CodeGen] use saturating FP casts when compiling with "no-strict-float-cast-overflow" We got an unintended consequence of the optimizer getting smarter when compiling in a non-standard mode, and there's no good way to inhibit those optimizations at a later stage. The test is based on an example linked from D92270. We allow the "no-strict-float-cast-overflow" exception to normal C cast rules to preserve legacy code that does not expect overflowing casts from FP to int to produce UB. See D46236 for details. Differential Revision: https://reviews.llvm.org/D115804
2021-12-16 21:37:44 +08:00
Use functions with prototypes when appropriate; NFC A significant number of our tests in C accidentally use functions without prototypes. This patch converts the function signatures to have a prototype for the situations where the test is not specific to K&R C declarations. e.g., void func(); becomes void func(void); This is the eleventh batch of tests being updated (there are a significant number of other tests left to be updated).
2022-02-16 05:06:01 +08:00
int main(void) {
[CodeGen] use saturating FP casts when compiling with "no-strict-float-cast-overflow" We got an unintended consequence of the optimizer getting smarter when compiling in a non-standard mode, and there's no good way to inhibit those optimizations at a later stage. The test is based on an example linked from D92270. We allow the "no-strict-float-cast-overflow" exception to normal C cast rules to preserve legacy code that does not expect overflowing casts from FP to int to produce UB. See D46236 for details. Differential Revision: https://reviews.llvm.org/D115804
2021-12-16 21:37:44 +08:00
double d = 1e20;
return (int)d != 1e20 && (unsigned)d != 1e20;
[Driver, CodeGen] add options to enable/disable an FP cast optimization As discussed in the post-commit thread for: rL330437 ( http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20180423/545906.html ) We need a way to opt-out of a float-to-int-to-float cast optimization because too much existing code relies on the platform-specific undefined result of those casts when the float-to-int overflows. The LLVM changes associated with adding this function attribute are here: rL330947 rL330950 rL330951 Also as suggested, I changed the LLVM doc to mention the specific sanitizer flag that catches this problem: rL330958 Differential Revision: https://reviews.llvm.org/D46135 llvm-svn: 331041
2018-04-27 22:22:48 +08:00
}