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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
// NOSTRICT-LABEL: main
// NOSTRICT: attributes #0 = {{.*}}"strict-float-cast-overflow"="false"{{.*}}
[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
// STRICT-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
int main() {
return 0;
}