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Jan Philipp Haferandrewrk
Jan Philipp Hafer
authored and
andrewrk
committed
compiler_rt: add __clzdi2 and __clzti2
- structure derived from shift.zig - rename clzsi2.zig to count0bits.zig - test cases derived from clzsi2_test.zig See #1290
1 parent 04b8016 commit 81e2034

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6 files changed

+787
-23
lines changed

6 files changed

+787
-23
lines changed

‎CMakeLists.txt

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -447,8 +447,8 @@ set(ZIG_STAGE2_SOURCES
447447
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/addXf3.zig"
448448
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/atomics.zig"
449449
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/clear_cache.zig"
450-
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/clzsi2.zig"
451450
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/compareXf2.zig"
451+
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/count0bits.zig"
452452
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/divdf3.zig"
453453
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/divsf3.zig"
454454
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/divtf3.zig"

‎lib/std/special/compiler_rt.zig

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -269,8 +269,12 @@ comptime {
269269
const __negdf2 = @import("compiler_rt/negXf2.zig").__negdf2;
270270
@export(__negdf2, .{ .name = "__negdf2", .linkage = linkage });
271271

272-
const __clzsi2 = @import("compiler_rt/clzsi2.zig").__clzsi2;
272+
const __clzsi2 = @import("compiler_rt/count0bits.zig").__clzsi2;
273273
@export(__clzsi2, .{ .name = "__clzsi2", .linkage = linkage });
274+
const __clzdi2 = @import("compiler_rt/count0bits.zig").__clzdi2;
275+
@export(__clzdi2, .{ .name = "__clzdi2", .linkage = linkage });
276+
const __clzti2 = @import("compiler_rt/count0bits.zig").__clzti2;
277+
@export(__clzti2, .{ .name = "__clzti2", .linkage = linkage });
274278

275279
if (builtin.link_libc and os_tag == .openbsd) {
276280
const __emutls_get_address = @import("compiler_rt/emutls.zig").__emutls_get_address;

‎lib/std/special/compiler_rt/clzdi2_test.zig

Lines changed: 329 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,329 @@
1+
const clz = @import("count0bits.zig");
2+
const testing = @import("std").testing;
3+
4+
fn test__clzdi2(a: u64, expected: i64) !void {
5+
// XXX At high optimization levels this test may be horribly miscompiled if
6+
// one of the naked implementations is selected.
7+
var nakedClzdi2 = clz.__clzdi2;
8+
var actualClzdi2 = @ptrCast(fn (a: i64) callconv(.C) i32, nakedClzdi2);
9+
var x = @bitCast(i64, a);
10+
var result = actualClzdi2(x);
11+
try testing.expectEqual(expected, result);
12+
}
13+
14+
test "clzdi2" {
15+
try test__clzdi2(0x00800000_00000000, 8);
16+
try test__clzdi2(0x01000000_00000000, 7);
17+
try test__clzdi2(0x02000000_00000000, 6);
18+
try test__clzdi2(0x03000000_00000000, 6);
19+
try test__clzdi2(0x04000000_00000000, 5);
20+
try test__clzdi2(0x05000000_00000000, 5);
21+
try test__clzdi2(0x06000000_00000000, 5);
22+
try test__clzdi2(0x07000000_00000000, 5);
23+
try test__clzdi2(0x08000000_00000000, 4);
24+
try test__clzdi2(0x09000000_00000000, 4);
25+
try test__clzdi2(0x0A000000_00000000, 4);
26+
try test__clzdi2(0x0B000000_00000000, 4);
27+
try test__clzdi2(0x0C000000_00000000, 4);
28+
try test__clzdi2(0x0D000000_00000000, 4);
29+
try test__clzdi2(0x0E000000_00000000, 4);
30+
try test__clzdi2(0x0F000000_00000000, 4);
31+
try test__clzdi2(0x10000000_00000000, 3);
32+
try test__clzdi2(0x11000000_00000000, 3);
33+
try test__clzdi2(0x12000000_00000000, 3);
34+
try test__clzdi2(0x13000000_00000000, 3);
35+
try test__clzdi2(0x14000000_00000000, 3);
36+
try test__clzdi2(0x15000000_00000000, 3);
37+
try test__clzdi2(0x16000000_00000000, 3);
38+
try test__clzdi2(0x17000000_00000000, 3);
39+
try test__clzdi2(0x18000000_00000000, 3);
40+
try test__clzdi2(0x19000000_00000000, 3);
41+
try test__clzdi2(0x1A000000_00000000, 3);
42+
try test__clzdi2(0x1B000000_00000000, 3);
43+
try test__clzdi2(0x1C000000_00000000, 3);
44+
try test__clzdi2(0x1D000000_00000000, 3);
45+
try test__clzdi2(0x1E000000_00000000, 3);
46+
try test__clzdi2(0x1F000000_00000000, 3);
47+
try test__clzdi2(0x20000000_00000000, 2);
48+
try test__clzdi2(0x21000000_00000000, 2);
49+
try test__clzdi2(0x22000000_00000000, 2);
50+
try test__clzdi2(0x23000000_00000000, 2);
51+
try test__clzdi2(0x24000000_00000000, 2);
52+
try test__clzdi2(0x25000000_00000000, 2);
53+
try test__clzdi2(0x26000000_00000000, 2);
54+
try test__clzdi2(0x27000000_00000000, 2);
55+
try test__clzdi2(0x28000000_00000000, 2);
56+
try test__clzdi2(0x29000000_00000000, 2);
57+
try test__clzdi2(0x2A000000_00000000, 2);
58+
try test__clzdi2(0x2B000000_00000000, 2);
59+
try test__clzdi2(0x2C000000_00000000, 2);
60+
try test__clzdi2(0x2D000000_00000000, 2);
61+
try test__clzdi2(0x2E000000_00000000, 2);
62+
try test__clzdi2(0x2F000000_00000000, 2);
63+
try test__clzdi2(0x30000000_00000000, 2);
64+
try test__clzdi2(0x31000000_00000000, 2);
65+
try test__clzdi2(0x32000000_00000000, 2);
66+
try test__clzdi2(0x33000000_00000000, 2);
67+
try test__clzdi2(0x34000000_00000000, 2);
68+
try test__clzdi2(0x35000000_00000000, 2);
69+
try test__clzdi2(0x36000000_00000000, 2);
70+
try test__clzdi2(0x37000000_00000000, 2);
71+
try test__clzdi2(0x38000000_00000000, 2);
72+
try test__clzdi2(0x39000000_00000000, 2);
73+
try test__clzdi2(0x3A000000_00000000, 2);
74+
try test__clzdi2(0x3B000000_00000000, 2);
75+
try test__clzdi2(0x3C000000_00000000, 2);
76+
try test__clzdi2(0x3D000000_00000000, 2);
77+
try test__clzdi2(0x3E000000_00000000, 2);
78+
try test__clzdi2(0x3F000000_00000000, 2);
79+
try test__clzdi2(0x40000000_00000000, 1);
80+
try test__clzdi2(0x41000000_00000000, 1);
81+
try test__clzdi2(0x42000000_00000000, 1);
82+
try test__clzdi2(0x43000000_00000000, 1);
83+
try test__clzdi2(0x44000000_00000000, 1);
84+
try test__clzdi2(0x45000000_00000000, 1);
85+
try test__clzdi2(0x46000000_00000000, 1);
86+
try test__clzdi2(0x47000000_00000000, 1);
87+
try test__clzdi2(0x48000000_00000000, 1);
88+
try test__clzdi2(0x49000000_00000000, 1);
89+
try test__clzdi2(0x4A000000_00000000, 1);
90+
try test__clzdi2(0x4B000000_00000000, 1);
91+
try test__clzdi2(0x4C000000_00000000, 1);
92+
try test__clzdi2(0x4D000000_00000000, 1);
93+
try test__clzdi2(0x4E000000_00000000, 1);
94+
try test__clzdi2(0x4F000000_00000000, 1);
95+
try test__clzdi2(0x50000000_00000000, 1);
96+
try test__clzdi2(0x51000000_00000000, 1);
97+
try test__clzdi2(0x52000000_00000000, 1);
98+
try test__clzdi2(0x53000000_00000000, 1);
99+
try test__clzdi2(0x54000000_00000000, 1);
100+
try test__clzdi2(0x55000000_00000000, 1);
101+
try test__clzdi2(0x56000000_00000000, 1);
102+
try test__clzdi2(0x57000000_00000000, 1);
103+
try test__clzdi2(0x58000000_00000000, 1);
104+
try test__clzdi2(0x59000000_00000000, 1);
105+
try test__clzdi2(0x5A000000_00000000, 1);
106+
try test__clzdi2(0x5B000000_00000000, 1);
107+
try test__clzdi2(0x5C000000_00000000, 1);
108+
try test__clzdi2(0x5D000000_00000000, 1);
109+
try test__clzdi2(0x5E000000_00000000, 1);
110+
try test__clzdi2(0x5F000000_00000000, 1);
111+
try test__clzdi2(0x60000000_00000000, 1);
112+
try test__clzdi2(0x61000000_00000000, 1);
113+
try test__clzdi2(0x62000000_00000000, 1);
114+
try test__clzdi2(0x63000000_00000000, 1);
115+
try test__clzdi2(0x64000000_00000000, 1);
116+
try test__clzdi2(0x65000000_00000000, 1);
117+
try test__clzdi2(0x66000000_00000000, 1);
118+
try test__clzdi2(0x67000000_00000000, 1);
119+
try test__clzdi2(0x68000000_00000000, 1);
120+
try test__clzdi2(0x69000000_00000000, 1);
121+
try test__clzdi2(0x6A000000_00000000, 1);
122+
try test__clzdi2(0x6B000000_00000000, 1);
123+
try test__clzdi2(0x6C000000_00000000, 1);
124+
try test__clzdi2(0x6D000000_00000000, 1);
125+
try test__clzdi2(0x6E000000_00000000, 1);
126+
try test__clzdi2(0x6F000000_00000000, 1);
127+
try test__clzdi2(0x70000000_00000000, 1);
128+
try test__clzdi2(0x71000000_00000000, 1);
129+
try test__clzdi2(0x72000000_00000000, 1);
130+
try test__clzdi2(0x73000000_00000000, 1);
131+
try test__clzdi2(0x74000000_00000000, 1);
132+
try test__clzdi2(0x75000000_00000000, 1);
133+
try test__clzdi2(0x76000000_00000000, 1);
134+
try test__clzdi2(0x77000000_00000000, 1);
135+
try test__clzdi2(0x78000000_00000000, 1);
136+
try test__clzdi2(0x79000000_00000000, 1);
137+
try test__clzdi2(0x7A000000_00000000, 1);
138+
try test__clzdi2(0x7B000000_00000000, 1);
139+
try test__clzdi2(0x7C000000_00000000, 1);
140+
try test__clzdi2(0x7D000000_00000000, 1);
141+
try test__clzdi2(0x7E000000_00000000, 1);
142+
try test__clzdi2(0x7F000000_00000000, 1);
143+
try test__clzdi2(0x80000000_00000000, 0);
144+
try test__clzdi2(0x81000000_00000000, 0);
145+
try test__clzdi2(0x82000000_00000000, 0);
146+
try test__clzdi2(0x83000000_00000000, 0);
147+
try test__clzdi2(0x84000000_00000000, 0);
148+
try test__clzdi2(0x85000000_00000000, 0);
149+
try test__clzdi2(0x86000000_00000000, 0);
150+
try test__clzdi2(0x87000000_00000000, 0);
151+
try test__clzdi2(0x88000000_00000000, 0);
152+
try test__clzdi2(0x89000000_00000000, 0);
153+
try test__clzdi2(0x8A000000_00000000, 0);
154+
try test__clzdi2(0x8B000000_00000000, 0);
155+
try test__clzdi2(0x8C000000_00000000, 0);
156+
try test__clzdi2(0x8D000000_00000000, 0);
157+
try test__clzdi2(0x8E000000_00000000, 0);
158+
try test__clzdi2(0x8F000000_00000000, 0);
159+
try test__clzdi2(0x90000000_00000000, 0);
160+
try test__clzdi2(0x91000000_00000000, 0);
161+
try test__clzdi2(0x92000000_00000000, 0);
162+
try test__clzdi2(0x93000000_00000000, 0);
163+
try test__clzdi2(0x94000000_00000000, 0);
164+
try test__clzdi2(0x95000000_00000000, 0);
165+
try test__clzdi2(0x96000000_00000000, 0);
166+
try test__clzdi2(0x97000000_00000000, 0);
167+
try test__clzdi2(0x98000000_00000000, 0);
168+
try test__clzdi2(0x99000000_00000000, 0);
169+
try test__clzdi2(0x9A000000_00000000, 0);
170+
try test__clzdi2(0x9B000000_00000000, 0);
171+
try test__clzdi2(0x9C000000_00000000, 0);
172+
try test__clzdi2(0x9D000000_00000000, 0);
173+
try test__clzdi2(0x9E000000_00000000, 0);
174+
try test__clzdi2(0x9F000000_00000000, 0);
175+
try test__clzdi2(0xA0000000_00000000, 0);
176+
try test__clzdi2(0xA1000000_00000000, 0);
177+
try test__clzdi2(0xA2000000_00000000, 0);
178+
try test__clzdi2(0xA3000000_00000000, 0);
179+
try test__clzdi2(0xA4000000_00000000, 0);
180+
try test__clzdi2(0xA5000000_00000000, 0);
181+
try test__clzdi2(0xA6000000_00000000, 0);
182+
try test__clzdi2(0xA7000000_00000000, 0);
183+
try test__clzdi2(0xA8000000_00000000, 0);
184+
try test__clzdi2(0xA9000000_00000000, 0);
185+
try test__clzdi2(0xAA000000_00000000, 0);
186+
try test__clzdi2(0xAB000000_00000000, 0);
187+
try test__clzdi2(0xAC000000_00000000, 0);
188+
try test__clzdi2(0xAD000000_00000000, 0);
189+
try test__clzdi2(0xAE000000_00000000, 0);
190+
try test__clzdi2(0xAF000000_00000000, 0);
191+
try test__clzdi2(0xB0000000_00000000, 0);
192+
try test__clzdi2(0xB1000000_00000000, 0);
193+
try test__clzdi2(0xB2000000_00000000, 0);
194+
try test__clzdi2(0xB3000000_00000000, 0);
195+
try test__clzdi2(0xB4000000_00000000, 0);
196+
try test__clzdi2(0xB5000000_00000000, 0);
197+
try test__clzdi2(0xB6000000_00000000, 0);
198+
try test__clzdi2(0xB7000000_00000000, 0);
199+
try test__clzdi2(0xB8000000_00000000, 0);
200+
try test__clzdi2(0xB9000000_00000000, 0);
201+
try test__clzdi2(0xBA000000_00000000, 0);
202+
try test__clzdi2(0xBB000000_00000000, 0);
203+
try test__clzdi2(0xBC000000_00000000, 0);
204+
try test__clzdi2(0xBD000000_00000000, 0);
205+
try test__clzdi2(0xBE000000_00000000, 0);
206+
try test__clzdi2(0xBF000000_00000000, 0);
207+
try test__clzdi2(0xC0000000_00000000, 0);
208+
try test__clzdi2(0xC1000000_00000000, 0);
209+
try test__clzdi2(0xC2000000_00000000, 0);
210+
try test__clzdi2(0xC3000000_00000000, 0);
211+
try test__clzdi2(0xC4000000_00000000, 0);
212+
try test__clzdi2(0xC5000000_00000000, 0);
213+
try test__clzdi2(0xC6000000_00000000, 0);
214+
try test__clzdi2(0xC7000000_00000000, 0);
215+
try test__clzdi2(0xC8000000_00000000, 0);
216+
try test__clzdi2(0xC9000000_00000000, 0);
217+
try test__clzdi2(0xCA000000_00000000, 0);
218+
try test__clzdi2(0xCB000000_00000000, 0);
219+
try test__clzdi2(0xCC000000_00000000, 0);
220+
try test__clzdi2(0xCD000000_00000000, 0);
221+
try test__clzdi2(0xCE000000_00000000, 0);
222+
try test__clzdi2(0xCF000000_00000000, 0);
223+
try test__clzdi2(0xD0000000_00000000, 0);
224+
try test__clzdi2(0xD1000000_00000000, 0);
225+
try test__clzdi2(0xD2000000_00000000, 0);
226+
try test__clzdi2(0xD3000000_00000000, 0);
227+
try test__clzdi2(0xD4000000_00000000, 0);
228+
try test__clzdi2(0xD5000000_00000000, 0);
229+
try test__clzdi2(0xD6000000_00000000, 0);
230+
try test__clzdi2(0xD7000000_00000000, 0);
231+
try test__clzdi2(0xD8000000_00000000, 0);
232+
try test__clzdi2(0xD9000000_00000000, 0);
233+
try test__clzdi2(0xDA000000_00000000, 0);
234+
try test__clzdi2(0xDB000000_00000000, 0);
235+
try test__clzdi2(0xDC000000_00000000, 0);
236+
try test__clzdi2(0xDD000000_00000000, 0);
237+
try test__clzdi2(0xDE000000_00000000, 0);
238+
try test__clzdi2(0xDF000000_00000000, 0);
239+
try test__clzdi2(0xE0000000_00000000, 0);
240+
try test__clzdi2(0xE1000000_00000000, 0);
241+
try test__clzdi2(0xE2000000_00000000, 0);
242+
try test__clzdi2(0xE3000000_00000000, 0);
243+
try test__clzdi2(0xE4000000_00000000, 0);
244+
try test__clzdi2(0xE5000000_00000000, 0);
245+
try test__clzdi2(0xE6000000_00000000, 0);
246+
try test__clzdi2(0xE7000000_00000000, 0);
247+
try test__clzdi2(0xE8000000_00000000, 0);
248+
try test__clzdi2(0xE9000000_00000000, 0);
249+
try test__clzdi2(0xEA000000_00000000, 0);
250+
try test__clzdi2(0xEB000000_00000000, 0);
251+
try test__clzdi2(0xEC000000_00000000, 0);
252+
try test__clzdi2(0xED000000_00000000, 0);
253+
try test__clzdi2(0xEE000000_00000000, 0);
254+
try test__clzdi2(0xEF000000_00000000, 0);
255+
try test__clzdi2(0xF0000000_00000000, 0);
256+
try test__clzdi2(0xF1000000_00000000, 0);
257+
try test__clzdi2(0xF2000000_00000000, 0);
258+
try test__clzdi2(0xF3000000_00000000, 0);
259+
try test__clzdi2(0xF4000000_00000000, 0);
260+
try test__clzdi2(0xF5000000_00000000, 0);
261+
try test__clzdi2(0xF6000000_00000000, 0);
262+
try test__clzdi2(0xF7000000_00000000, 0);
263+
try test__clzdi2(0xF8000000_00000000, 0);
264+
try test__clzdi2(0xF9000000_00000000, 0);
265+
try test__clzdi2(0xFA000000_00000000, 0);
266+
try test__clzdi2(0xFB000000_00000000, 0);
267+
try test__clzdi2(0xFC000000_00000000, 0);
268+
try test__clzdi2(0xFD000000_00000000, 0);
269+
try test__clzdi2(0xFE000000_00000000, 0);
270+
try test__clzdi2(0xFF000000_00000000, 0);
271+
272+
try test__clzdi2(0x00000000_00000000, 64);
273+
try test__clzdi2(0x00000000_00000001, 63);
274+
try test__clzdi2(0x00000000_00000002, 62);
275+
try test__clzdi2(0x00000000_00000004, 61);
276+
try test__clzdi2(0x00000000_00000008, 60);
277+
try test__clzdi2(0x00000000_00000010, 59);
278+
try test__clzdi2(0x00000000_00000020, 58);
279+
try test__clzdi2(0x00000000_00000040, 57);
280+
try test__clzdi2(0x00000000_00000080, 56);
281+
try test__clzdi2(0x00000000_00000100, 55);
282+
try test__clzdi2(0x00000000_00000200, 54);
283+
try test__clzdi2(0x00000000_00000400, 53);
284+
try test__clzdi2(0x00000000_00000800, 52);
285+
try test__clzdi2(0x00000000_00001000, 51);
286+
try test__clzdi2(0x00000000_00002000, 50);
287+
try test__clzdi2(0x00000000_00004000, 49);
288+
try test__clzdi2(0x00000000_00008000, 48);
289+
try test__clzdi2(0x00000000_00010000, 47);
290+
try test__clzdi2(0x00000000_00020000, 46);
291+
try test__clzdi2(0x00000000_00040000, 45);
292+
try test__clzdi2(0x00000000_00080000, 44);
293+
try test__clzdi2(0x00000000_00100000, 43);
294+
try test__clzdi2(0x00000000_00200000, 42);
295+
try test__clzdi2(0x00000000_00400000, 41);
296+
try test__clzdi2(0x00000000_00800000, 40);
297+
try test__clzdi2(0x00000000_01000000, 39);
298+
try test__clzdi2(0x00000000_02000000, 38);
299+
try test__clzdi2(0x00000000_04000000, 37);
300+
try test__clzdi2(0x00000000_08000000, 36);
301+
try test__clzdi2(0x00000000_10000000, 35);
302+
try test__clzdi2(0x00000000_20000000, 34);
303+
try test__clzdi2(0x00000000_40000000, 33);
304+
try test__clzdi2(0x00000000_80000000, 32);
305+
306+
try test__clzdi2(0x00000001_00000000, 31);
307+
try test__clzdi2(0x00000002_00000000, 30);
308+
try test__clzdi2(0x00000004_00000000, 29);
309+
try test__clzdi2(0x00000008_00000000, 28);
310+
try test__clzdi2(0x00000010_00000000, 27);
311+
try test__clzdi2(0x00000020_00000000, 26);
312+
try test__clzdi2(0x00000040_00000000, 25);
313+
try test__clzdi2(0x00000080_00000000, 24);
314+
try test__clzdi2(0x00000100_00000000, 23);
315+
try test__clzdi2(0x00000200_00000000, 22);
316+
try test__clzdi2(0x00000400_00000000, 21);
317+
try test__clzdi2(0x00000800_00000000, 20);
318+
try test__clzdi2(0x00001000_00000000, 19);
319+
try test__clzdi2(0x00002000_00000000, 18);
320+
try test__clzdi2(0x00004000_00000000, 17);
321+
try test__clzdi2(0x00008000_00000000, 16);
322+
try test__clzdi2(0x00010000_00000000, 15);
323+
try test__clzdi2(0x00020000_00000000, 14);
324+
try test__clzdi2(0x00040000_00000000, 13);
325+
try test__clzdi2(0x00080000_00000000, 12);
326+
try test__clzdi2(0x00100000_00000000, 11);
327+
try test__clzdi2(0x00200000_00000000, 10);
328+
try test__clzdi2(0x00400000_00000000, 9);
329+
}

‎lib/std/special/compiler_rt/clzsi2_test.zig

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,10 +1,10 @@
1-
const clzsi2 = @import("clzsi2.zig");
1+
const clz = @import("count0bits.zig");
22
const testing = @import("std").testing;
33

44
fn test__clzsi2(a: u32, expected: i32) !void {
55
// XXX At high optimization levels this test may be horribly miscompiled if
66
// one of the naked implementations is selected.
7-
var nakedClzsi2 = clzsi2.__clzsi2;
7+
var nakedClzsi2 = clz.__clzsi2;
88
var actualClzsi2 = @ptrCast(fn (a: i32) callconv(.C) i32, nakedClzsi2);
99
var x = @bitCast(i32, a);
1010
var result = actualClzsi2(x);
@@ -268,6 +268,8 @@ test "clzsi2" {
268268
try test__clzsi2(0xFD000000, 0);
269269
try test__clzsi2(0xFE000000, 0);
270270
try test__clzsi2(0xFF000000, 0);
271+
// arm and thumb1 assume input a != 0
272+
//try test__clzsi2(0x00000000, 32);
271273
try test__clzsi2(0x00000001, 31);
272274
try test__clzsi2(0x00000002, 30);
273275
try test__clzsi2(0x00000004, 29);

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