================
@@ -968,10 +968,7 @@ class FPOptionsOverride {
setAllowFPContractAcrossStatement();
}
- void setDisallowOptimizations() {
- setFPPreciseEnabled(true);
- setDisallowFPContract();
- }
+ void setDisallowOptimizations() { setFPPreciseEnabled(true); }
----------------
wjristow wrote:
Actually, instead of just removing the call to `setDisallowFPContract()`, we
should instead explicitly set the FP Contraction state to "on" (which is the
default at `-O0`). That is, we should call
`setAllowFPContractWithinStatement()`.
In particular, if the user is compiling with `-ffast-math`, then the FP
Contraction state will be `-ffp-contract=fast` (allowing FMA across multiple
statements). And if they applied `optnone`, then by removing the call to
`setDisallowFPContract()`, we would mistakenly leave that inter-statement FMA
enabled. By calling `setAllowFPContractWithinStatement()` we are explicitly
setting it the equivalent of the command-line option `-ffp-contract=on`, which
is the desired state of `-O0` (and `optnone`).
https://github.com/llvm/llvm-project/pull/91061
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