https://bugs.llvm.org/show_bug.cgi?id=38599
Bug ID: 38599
Summary: wasm32 reduce.fmin/fmax work incorrectly for <float x
32> vectors containing NaNs
Product: new-bugs
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: gonzalob...@gmail.com
CC: llvm-bugs@lists.llvm.org
This is an attempt at reporting Rust packed_simd/91
(https://github.com/rust-lang-nursery/packed_simd/issues/91).
There we have to functions, min_element and max_element, that work on packed
float vectors. For <4 x float> and min we emit the following LLVM-IR:
define float @min_4x32(<4 x float> %a) {
%b = tail call float @llvm.experimental.reduce.fmin.v4f32(<4 x float> %a)
ret float %b
}
declare float @llvm.experimental.reduce.fmin.v4f32(<4 x float>)
We have a test that initializes the first element of the vector with NaN, and
all other elements with 3.0, and checks that the result is 3.0.
This tests passes on wasm32-unknown-unknown for all f32 and f64 vectors except
for f32x16 (512-bit wide) vectors, where it fails for both the `min` and `max`
operations. Instead of returning `3.0`, this functions return `NaN` (the input
is `<float x16> <NaN, 3.0, ..., 3.0>`.
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