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x86_64: reuse single register code during register write splitting

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This commit is contained in:
Jacob Young 2025-03-07 23:58:23 -05:00
parent 54ed62755f
commit 5d115632d4
1 changed files with 2 additions and 31 deletions
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33
src/arch/x86_64/CodeGen.zig
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@ -101617,7 +101617,7 @@ const Temp = struct {
.float_combine => 8,
.sseup, .x87up, .complex_x87, .none, .win_i128, .integer_per_element => unreachable,
};
const part_ty: Type = switch (class) {
try dst.writeReg(part_disp, switch (class) {
.integer => .u64,
.sse => switch (part_size) {
else => unreachable,
@ -101629,36 +101629,7 @@ const Temp = struct {
.float => .f32,
.float_combine => .vector_2_f32,
.sseup, .x87up, .complex_x87, .memory, .none, .win_i128, .integer_per_element => unreachable,
};
if (class == .x87 or std.math.isPowerOfTwo(part_size)) {
const strat = try cg.moveStrategy(part_ty, src_reg.class(), false);
try strat.write(cg, try dst.tracking(cg).short.mem(cg, .{
.size = switch (class) {
else => .fromSize(part_size),
.x87 => .tbyte,
},
.disp = part_disp,
}), registerAlias(src_reg, part_size));
} else {
const frame_size = std.math.ceilPowerOfTwoAssert(u32, part_size);
const frame_index = try cg.allocFrameIndex(.init(.{
.size = frame_size,
.alignment = .fromNonzeroByteUnits(frame_size),
}));
const strat = try cg.moveStrategy(part_ty, src_reg.class(), true);
try strat.write(cg, .{
.base = .{ .frame = frame_index },
.mod = .{ .rm = .{ .size = .fromSize(frame_size) } },
}, registerAlias(src_reg, frame_size));
var dst_ptr = try cg.tempInit(.usize, dst.tracking(cg).short.address());
try dst_ptr.toOffset(part_disp, cg);
var src_ptr = try cg.tempInit(.usize, .{ .lea_frame = .{ .index = frame_index } });
var len = try cg.tempInit(.usize, .{ .immediate = part_size });
try dst_ptr.memcpy(&src_ptr, &len, cg);
try dst_ptr.die(cg);
try src_ptr.die(cg);
try len.die(cg);
}
}, src_reg, cg);
part_disp += part_size;
remaining_abi_size -= part_size;
}