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Fast-math mode can ignore the difference between negative zero and zero #9056

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Merged
kripken merged 2 commits into from
Aug 28, 2026
+10 −7
Merged

Fast-math mode can ignore the difference between negative zero and zero #9056

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kripken Aug 28, 2026
8cc2d55
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kripken Aug 28, 2026
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,8 @@ Current Trunk
- Replace the `BINARYEN_ROOT` environment variable (used by developers who are
doing out-of-tree builds of binaryen) with `BINARYEN_BIN` (#9023)
- Reject non-natural alignment for atomic memory operations at parse time (#8962)
- Note that fast-math mode can ignore the difference between negative zero and
zero (like clang and gcc). (#9056)

v132
----
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3 changes: 2 additions & 1 deletion src/tools/optimization-options.h
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Expand Up @@ -306,7 +306,8 @@ struct OptimizationOptions : public ToolOptions {
.add(
"--fast-math",
"-ffm",
"Optimize floats without handling corner cases of NaNs and rounding",
"Optimize floats without handling corner cases of NaNs, rounding, and "
"negative zero",
OptimizationOptionsCategory,
Options::Arguments::Zero,
[this](Options*, const std::string&) { passOptions.fastMath = true; })
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4 changes: 2 additions & 2 deletions test/lit/help/wasm-metadce.test
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Expand Up @@ -679,8 +679,8 @@
;; CHECK-NEXT: application
;; CHECK-EMPTY:
;; CHECK-NEXT: --fast-math,-ffm Optimize floats without handling
;; CHECK-NEXT: corner cases of NaNs and
;; CHECK-NEXT: rounding
;; CHECK-NEXT: corner cases of NaNs, rounding,
;; CHECK-NEXT: and negative zero
;; CHECK-EMPTY:
;; CHECK-NEXT: --zero-filled-memory,-uim Assume that an imported memory
;; CHECK-NEXT: will be zero-initialized
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4 changes: 2 additions & 2 deletions test/lit/help/wasm-opt.test
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Expand Up @@ -715,8 +715,8 @@
;; CHECK-NEXT: application
;; CHECK-EMPTY:
;; CHECK-NEXT: --fast-math,-ffm Optimize floats without handling
;; CHECK-NEXT: corner cases of NaNs and
;; CHECK-NEXT: rounding
;; CHECK-NEXT: corner cases of NaNs, rounding,
;; CHECK-NEXT: and negative zero
;; CHECK-EMPTY:
;; CHECK-NEXT: --zero-filled-memory,-uim Assume that an imported memory
;; CHECK-NEXT: will be zero-initialized
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4 changes: 2 additions & 2 deletions test/lit/help/wasm2js.test
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Expand Up @@ -643,8 +643,8 @@
;; CHECK-NEXT: application
;; CHECK-EMPTY:
;; CHECK-NEXT: --fast-math,-ffm Optimize floats without handling
;; CHECK-NEXT: corner cases of NaNs and
;; CHECK-NEXT: rounding
;; CHECK-NEXT: corner cases of NaNs, rounding,
;; CHECK-NEXT: and negative zero
;; CHECK-EMPTY:
;; CHECK-NEXT: --zero-filled-memory,-uim Assume that an imported memory
;; CHECK-NEXT: will be zero-initialized
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