zig

commit 4ab7b459dfea45d1dbdfe301eeb840eaa796a4e7 (tree)
parent 94b504c9e41c84825708701a2bf7a3cc7bdca375
Author: LemonBoy <thatlemon@gmail.com>
Date:   Mon,  6 May 2019 21:48:10 +0200

Avoid endless recursion in __extendhfsf2

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.

Diffstat:
M
std/special/compiler_rt/extendXfYf2.zig
 | 
8
++++----

1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/std/special/compiler_rt/extendXfYf2.zig b/std/special/compiler_rt/extendXfYf2.zig
@@ -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);