float: Disable total_cmp sNaN tests for f16
#141676
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
rustbot has assigned @Mark-Simulacrum. Use |
rustbot
added
S-waiting-on-review
There is an LLVM bug with lowering of basic `f16` operations that mean a round trip via `__extendhfsf2` and `__truncsfhf2` may happen for simple `abs` calls or bitcasts [1]. This is problematic because the round trip quiets signaling NaNs. For most operations this is acceptable, but it is causing `total_cmp` tests to fail unless optimizations are enabled. Disable `total_cmp` tests involving signaling NaNs until this issue is resolved. Fixes: rust-lang/rustc_codegen_cranelift#1578 Fixes: rust-lang#141503 [1]: llvm/llvm-project#104915
tgross35
force-pushed
the
f16-disable-total-cmp
branch
from
a99f0ba to
19fd098
Compare
This was referenced May 28, 2025
|
@bors r+ rollup |
bors
added
S-waiting-on-bors
bors
added a commit
that referenced
this pull request
May 29, 2025
Rollup of 11 pull requests Successful merges: - #137574 (Make `std/src/num` mirror `core/src/num`) - #141384 (Enable review queue tracking) - #141448 (A variety of improvements to the codegen backends) - #141636 (avoid some usages of `&mut P<T>` in AST visitors) - #141676 (float: Disable `total_cmp` sNaN tests for `f16`) - #141705 (Add eslint as part of `tidy` run) - #141715 (Add `loongarch64` with `d` feature to `f32::midpoint` fast path) - #141723 (Provide secrets to try builds with new bors) - #141728 (Fix false documentation of FnCtxt::diverges) - #141729 (resolve target-libdir directly from rustc) - #141732 (creader: Remove extraenous String::clone) r? `@ghost` `@rustbot` modify labels: rollup
bors
added a commit
that referenced
this pull request
May 29, 2025
Rollup of 11 pull requests Successful merges: - #137574 (Make `std/src/num` mirror `core/src/num`) - #141384 (Enable review queue tracking) - #141448 (A variety of improvements to the codegen backends) - #141636 (avoid some usages of `&mut P<T>` in AST visitors) - #141676 (float: Disable `total_cmp` sNaN tests for `f16`) - #141705 (Add eslint as part of `tidy` run) - #141715 (Add `loongarch64` with `d` feature to `f32::midpoint` fast path) - #141723 (Provide secrets to try builds with new bors) - #141728 (Fix false documentation of FnCtxt::diverges) - #141729 (resolve target-libdir directly from rustc) - #141732 (creader: Remove extraenous String::clone) r? `@ghost` `@rustbot` modify labels: rollup
rust-timer
added a commit
that referenced
this pull request
May 30, 2025
Rollup merge of #141676 - tgross35:f16-disable-total-cmp, r=workingjubilee float: Disable `total_cmp` sNaN tests for `f16` There is an LLVM bug with lowering of basic `f16` operations that mean a round trip via `__extendhfsf2` and `__truncsfhf2` may happen for simple `abs` calls or bitcasts [1]. This is problematic because the round trip quiets signaling NaNs. For most operations this is acceptable, but it is causing `total_cmp` tests to fail unless optimizations are enabled. Disable `total_cmp` tests involving signaling NaNs until this issue is resolved. Fixes: rust-lang/rustc_codegen_cranelift#1578 Fixes: #141503 [1]: llvm/llvm-project#104915
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
There is an LLVM bug with lowering of basic
f16operations that mean a round trip via__extendhfsf2and__truncsfhf2may happen for simpleabscalls or bitcasts 1. This is problematic because the round trip quiets signaling NaNs. For most operations this is acceptable, but it is causingtotal_cmptests to fail unless optimizations are enabled.Disable
total_cmptests involving signaling NaNs until this issue is resolved.Fixes: rust-lang/rustc_codegen_cranelift#1578
Fixes: #141503