Mirrors/zig
1
0
Fork 0
mirror of https://codeberg.org/ziglang/zig.git synced 2026-04-26 13:01:34 +03:00
Code Issues Packages Projects Releases Wiki Activity

compiler-rt: work around LLVM not respecting -fno-builtin

Browse Source
This commit is contained in:
Matthew Lugg
2026-03-28 09:53:13 +00:00
parent 2ac47fe314
commit b36cfc6352
1 changed files with 6 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/compiler_rt/mulo.zig
+6 -1
View File
@@ -19,7 +19,12 @@ comptime {
inline fn muloXi4_genericSmall(comptime ST: type, a: ST, b: ST, overflow: *c_int) ST {
overflow.* = 0;
const min = math.minInt(ST);
const res: ST = a *% b;
const res: ST = if (ST == i128 and builtin.target.cpu.arch.isWasm()) res: {
// Despite compiler-rt being built with `-fno-builtin`, LLVM still converts this function to
// a call to `__muloti4` on WASM. This is an upstream bug: circumvent it by directly calling
// the "lower-level" compiler-rt routine for this wrapping multiplication.
break :res @import("mulXi3.zig").__multi3(a, b);
} else a *% b;
// Hacker's Delight section Overflow subsection Multiplication
// case a=-2^{31}, b=-1 problem, because
// on some machines a*b = -2^{31} with overflow