From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- vendor/compiler_builtins/libm/src/math/ilogb.rs | 31 +++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 vendor/compiler_builtins/libm/src/math/ilogb.rs (limited to 'vendor/compiler_builtins/libm/src/math/ilogb.rs') diff --git a/vendor/compiler_builtins/libm/src/math/ilogb.rs b/vendor/compiler_builtins/libm/src/math/ilogb.rs new file mode 100644 index 000000000..0a380b7ef --- /dev/null +++ b/vendor/compiler_builtins/libm/src/math/ilogb.rs @@ -0,0 +1,31 @@ +const FP_ILOGBNAN: i32 = -1 - 0x7fffffff; +const FP_ILOGB0: i32 = FP_ILOGBNAN; + +pub fn ilogb(x: f64) -> i32 { + let mut i: u64 = x.to_bits(); + let e = ((i >> 52) & 0x7ff) as i32; + + if e == 0 { + i <<= 12; + if i == 0 { + force_eval!(0.0 / 0.0); + return FP_ILOGB0; + } + /* subnormal x */ + let mut e = -0x3ff; + while (i >> 63) == 0 { + e -= 1; + i <<= 1; + } + e + } else if e == 0x7ff { + force_eval!(0.0 / 0.0); + if (i << 12) != 0 { + FP_ILOGBNAN + } else { + i32::max_value() + } + } else { + e - 0x3ff + } +} -- cgit v1.2.3