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Avoid endless recursion in __extendhfsf2

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On some platforms the conversion ended up creating a dangerous recursive
loop that ate all the stack.

The conversion to f16 is also pointless since we're operating on the raw
bits anyway.
This commit is contained in:
LemonBoy 2019-05-06 21:48:10 +02:00
parent 94b504c9e4
commit 4ab7b459df
1 changed files with 4 additions and 4 deletions
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8
std/special/compiler_rt/extendXfYf2.zig
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@ -3,20 +3,20 @@ const builtin = @import("builtin");
const is_test = builtin.is_test;
pub extern fn __extenddftf2(a: f64) f128 {
return extendXfYf2(f128, f64, a);
return extendXfYf2(f128, f64, @bitCast(u64, a));
}
pub extern fn __extendsftf2(a: f32) f128 {
return extendXfYf2(f128, f32, a);
return extendXfYf2(f128, f32, @bitCast(u32, a));
}
pub extern fn __extendhfsf2(a: u16) f32 {
return extendXfYf2(f32, f16, @bitCast(f16, a));
return extendXfYf2(f32, f16, a);
}
const CHAR_BIT = 8;
inline fn extendXfYf2(comptime dst_t: type, comptime src_t: type, a: src_t) dst_t {
inline fn extendXfYf2(comptime dst_t: type, comptime src_t: type, a: @IntType(false, @typeInfo(src_t).Float.bits)) dst_t {
const src_rep_t = @IntType(false, @typeInfo(src_t).Float.bits);
const dst_rep_t = @IntType(false, @typeInfo(dst_t).Float.bits);
const srcSigBits = std.math.floatMantissaBits(src_t);