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| author | Jacob Young <jacobly0@users.noreply.github.com> | 2023-04-14 04:47:33 -0400 |
|---|---|---|
| committer | Jacob Young <jacobly0@users.noreply.github.com> | 2023-04-16 17:05:34 -0400 |
| commit | c03771e1738dae25eccf7726dcc952ad5936ca15 (patch) | |
| tree | 66cb46d5aaf42d2b45d37424f85caacfc70dff05 /src | |
| parent | 08055f2942abe873283ec46f2656ecb932f915b3 (diff) | |
| download | zig-c03771e1738dae25eccf7726dcc952ad5936ca15.tar.gz zig-c03771e1738dae25eccf7726dcc952ad5936ca15.zip | |
x86_64: fix overflow of extended multiply
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/x86_64/CodeGen.zig | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/arch/x86_64/CodeGen.zig b/src/arch/x86_64/CodeGen.zig index 196dc330fb..ef6b5e246b 100644 --- a/src/arch/x86_64/CodeGen.zig +++ b/src/arch/x86_64/CodeGen.zig @@ -2089,12 +2089,14 @@ fn airMulWithOverflow(self: *Self, inst: Air.Inst.Index) !void { else => {}, } + // For now, this is the only supported multiply that doesn't fit in a register. + assert(dst_info.bits == 128 and src_pl.data == 64); const dst_abi_size = @intCast(i32, dst_ty.abiSize(self.target.*)); const dst_mcv = try self.allocRegOrMem(inst, false); try self.genSetStack( Type.u1, dst_mcv.stack_offset - dst_abi_size, - .{ .eflags = cc }, + .{ .immediate = 0 }, // 64x64 -> 128 never overflows .{}, ); try self.genSetStack(dst_ty, dst_mcv.stack_offset, partial_mcv, .{}); |