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+id = 1780
+title = "PowerPC mishandles xscmpudp instruction"
+state = "opened"
+created_at = "2023-07-23T02:53:14.731Z"
+closed_at = "n/a"
+labels = ["target: ppc", "workflow::Triaged"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1780"
+host-os = "Ubuntu 20.04"
+host-arch = "x86_64"
+qemu-version = "7.0.0"
+guest-os = "Ubuntu 20.04"
+guest-arch = "PowerPC64"
+description = """xscmpudp instruction is mishandled"""
+reproduce = """1. Compile the attached program with VSX (e.g. `RUSTFLAGS=-Ctarget-feature=+vsx cargo build --target=powerpc64-unknown-linux-gnu`)
+2. Run the program and expect assertions to pass.
+3. See assertions fail."""
+additional = """When VSX is disabled, the `fcmpu` instruction is emitted instead (and handled properly).  See the offending program:
+```
+pub fn main() {
+    use std::hint::black_box;
+    assert!(black_box(f64::NAN)
+        .clamp(black_box(0f64), black_box(0f64))
+        .is_nan());
+}
+```"""