Commit 9f48b2ab48bcd6cfba45b8dfc60d0ad9633b294e | zig

author	Marc Tiehuis <marc@tiehu.is> 2018-06-30 20:06:30+12:00
committer	Marc Tiehuis <marc@tiehu.is> 2018-06-30 21:58:59+12:00
log	9f48b2ab48bcd6cfba45b8dfc60d0ad9633b294e
tree	f4b01cbfcebc40284d0b7fe7aec3f371e32fc799
parent	814a34f263cbfeabbf7a898b3b70fa781baaccac

compiler_rt: Remove wrapping add/sub operators where unneeded

Closes #495.

8 files changed, 32 insertions(+), 32 deletions(-)

std
- special
  - compiler_rt
    floattidf.zig
    floattisf.zig
    floattitf.zig
    floatunditf.zig
    floatunsitf.zig
    floatuntidf.zig
    floatuntisf.zig
    floatuntitf.zig

std/special/compiler_rt/floattidf.zig+2-2

...	...	@@ -42,12 +42,12 @@ pub extern fn __floattidf(arg: i128) f64 {
42	42	}
43	43	// finish
44	44	a \|= @boolToInt((a & 4) != 0); // Or P into R
45		a +%= 1; // round - this step may add a significant bit
	45	a += 1; // round - this step may add a significant bit
46	46	a >>= 2; // dump Q and R
47	47	// a is now rounded to DBL_MANT_DIG or DBL_MANT_DIG+1 bits
48	48	if ((a & (u128(1) << DBL_MANT_DIG)) != 0) {
49	49	a >>= 1;
50		e +%= 1;
	50	e += 1;
51	51	}
52	52	// a is now rounded to DBL_MANT_DIG bits
53	53	} else {

std/special/compiler_rt/floattisf.zig+2-2

...	...	@@ -43,12 +43,12 @@ pub extern fn __floattisf(arg: i128) f32 {
43	43	}
44	44	// finish
45	45	a \|= @boolToInt((a & 4) != 0); // Or P into R
46		a +%= 1; // round - this step may add a significant bit
	46	a += 1; // round - this step may add a significant bit
47	47	a >>= 2; // dump Q and R
48	48	// a is now rounded to FLT_MANT_DIG or FLT_MANT_DIG+1 bits
49	49	if ((a & (u128(1) << FLT_MANT_DIG)) != 0) {
50	50	a >>= 1;
51		e +%= 1;
	51	e += 1;
52	52	}
53	53	// a is now rounded to FLT_MANT_DIG bits
54	54	} else {

std/special/compiler_rt/floattitf.zig+2-2

...	...	@@ -42,12 +42,12 @@ pub extern fn __floattitf(arg: i128) f128 {
42	42	}
43	43	// finish
44	44	a \|= @boolToInt((a & 4) != 0); // Or P into R
45		a +%= 1; // round - this step may add a significant bit
	45	a += 1; // round - this step may add a significant bit
46	46	a >>= 2; // dump Q and R
47	47	// a is now rounded to LDBL_MANT_DIG or LDBL_MANT_DIG+1 bits
48	48	if ((a & (u128(1) << LDBL_MANT_DIG)) != 0) {
49	49	a >>= 1;
50		e +%= 1;
	50	e += 1;
51	51	}
52	52	// a is now rounded to LDBL_MANT_DIG bits
53	53	} else {

std/special/compiler_rt/floatunditf.zig+1-1

...	...	@@ -1,6 +1,6 @@
1	1	const builtin = @import("builtin");
2	2	const is_test = builtin.is_test;
3		const std = @import("../../index.zig");
	3	const std = @import("std");
4	4
5	5	pub extern fn __floatunditf(a: u128) f128 {
6	6	@setRuntimeSafety(is_test);

std/special/compiler_rt/floatunsitf.zig+1-1

...	...	@@ -1,6 +1,6 @@
1	1	const builtin = @import("builtin");
2	2	const is_test = builtin.is_test;
3		const std = @import("../../index.zig");
	3	const std = @import("std");
4	4
5	5	pub extern fn __floatunsitf(a: u64) f128 {
6	6	@setRuntimeSafety(is_test);

std/special/compiler_rt/floatuntidf.zig+8-8

...	...	@@ -11,8 +11,8 @@ pub extern fn __floatuntidf(arg: u128) f64 {
11	11
12	12	var a = arg;
13	13	const N: u32 = @sizeOf(u128) * 8;
14		const sd = @bitCast(i32, N -% @clz(a)); // number of significant digits
15		var e: i32 = sd -% 1; // exponent
	14	const sd = @bitCast(i32, N - @clz(a)); // number of significant digits
	15	var e: i32 = sd - 1; // exponent
16	16	if (sd > DBL_MANT_DIG) {
17	17	// start: 0000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQxxxxxxxxxxxxxxxxxx
18	18	// finish: 000000000000000000000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQR
...	...	@@ -27,28 +27,28 @@ pub extern fn __floatuntidf(arg: u128) f64 {
27	27	},
28	28	DBL_MANT_DIG + 2 => {},
29	29	else => {
30		const shift_amt = @bitCast(i32, N +% (DBL_MANT_DIG + 2)) -% sd;
	30	const shift_amt = @bitCast(i32, N + (DBL_MANT_DIG + 2)) - sd;
31	31	const shift_amt_u7 = @intCast(u7, shift_amt);
32		a = (a >> @intCast(u7, sd -% (DBL_MANT_DIG + 2))) \|
	32	a = (a >> @intCast(u7, sd - (DBL_MANT_DIG + 2))) \|
33	33	@boolToInt((a & (u128(@maxValue(u128)) >> shift_amt_u7)) != 0);
34	34	},
35	35	}
36	36	// finish
37	37	a \|= @boolToInt((a & 4) != 0); // Or P into R
38		a +%= 1; // round - this step may add a significant bit
	38	a += 1; // round - this step may add a significant bit
39	39	a >>= 2; // dump Q and R
40	40	// a is now rounded to DBL_MANT_DIG or DBL_MANT_DIG+1 bits
41	41	if ((a & (u128(1) << DBL_MANT_DIG)) != 0) {
42	42	a >>= 1;
43		e +%= 1;
	43	e += 1;
44	44	}
45	45	// a is now rounded to DBL_MANT_DIG bits
46	46	} else {
47		a <<= @intCast(u7, DBL_MANT_DIG -% sd);
	47	a <<= @intCast(u7, DBL_MANT_DIG - sd);
48	48	// a is now rounded to DBL_MANT_DIG bits
49	49	}
50	50
51		const high: u64 = @bitCast(u32, (e +% 1023) << 20) \| // exponent
	51	const high: u64 = @bitCast(u32, (e + 1023) << 20) \| // exponent
52	52	(@truncate(u32, a >> 32) & 0x000FFFFF); // mantissa-high
53	53	const low = @truncate(u32, a); // mantissa-low
54	54

std/special/compiler_rt/floatuntisf.zig+8-8

...	...	@@ -11,8 +11,8 @@ pub extern fn __floatuntisf(arg: u128) f32 {
11	11
12	12	var a = arg;
13	13	const N: u32 = @sizeOf(u128) * 8;
14		const sd = @bitCast(i32, N -% @clz(a)); // number of significant digits
15		var e: i32 = sd -% 1; // exponent
	14	const sd = @bitCast(i32, N - @clz(a)); // number of significant digits
	15	var e: i32 = sd - 1; // exponent
16	16	if (sd > FLT_MANT_DIG) {
17	17	// start: 0000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQxxxxxxxxxxxxxxxxxx
18	18	// finish: 000000000000000000000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQR
...	...	@@ -27,28 +27,28 @@ pub extern fn __floatuntisf(arg: u128) f32 {
27	27	},
28	28	FLT_MANT_DIG + 2 => {},
29	29	else => {
30		const shift_amt = @bitCast(i32, N +% (FLT_MANT_DIG + 2)) -% sd;
	30	const shift_amt = @bitCast(i32, N + (FLT_MANT_DIG + 2)) - sd;
31	31	const shift_amt_u7 = @intCast(u7, shift_amt);
32		a = (a >> @intCast(u7, sd -% (FLT_MANT_DIG + 2))) \|
	32	a = (a >> @intCast(u7, sd - (FLT_MANT_DIG + 2))) \|
33	33	@boolToInt((a & (u128(@maxValue(u128)) >> shift_amt_u7)) != 0);
34	34	},
35	35	}
36	36	// finish
37	37	a \|= @boolToInt((a & 4) != 0); // Or P into R
38		a +%= 1; // round - this step may add a significant bit
	38	a += 1; // round - this step may add a significant bit
39	39	a >>= 2; // dump Q and R
40	40	// a is now rounded to FLT_MANT_DIG or FLT_MANT_DIG+1 bits
41	41	if ((a & (u128(1) << FLT_MANT_DIG)) != 0) {
42	42	a >>= 1;
43		e +%= 1;
	43	e += 1;
44	44	}
45	45	// a is now rounded to FLT_MANT_DIG bits
46	46	} else {
47		a <<= @intCast(u7, FLT_MANT_DIG -% sd);
	47	a <<= @intCast(u7, FLT_MANT_DIG - sd);
48	48	// a is now rounded to FLT_MANT_DIG bits
49	49	}
50	50
51		const high = @bitCast(u32, (e +% 127) << 23); // exponent
	51	const high = @bitCast(u32, (e + 127) << 23); // exponent
52	52	const low = @truncate(u32, a) & 0x007fffff; // mantissa
53	53
54	54	return @bitCast(f32, high \| low);

std/special/compiler_rt/floatuntitf.zig+8-8

...	...	@@ -11,8 +11,8 @@ pub extern fn __floatuntitf(arg: u128) f128 {
11	11
12	12	var a = arg;
13	13	const N: u32 = @sizeOf(u128) * 8;
14		const sd = @bitCast(i32, N -% @clz(a)); // number of significant digits
15		var e: i32 = sd -% 1; // exponent
	14	const sd = @bitCast(i32, N - @clz(a)); // number of significant digits
	15	var e: i32 = sd - 1; // exponent
16	16	if (sd > LDBL_MANT_DIG) {
17	17	// start: 0000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQxxxxxxxxxxxxxxxxxx
18	18	// finish: 000000000000000000000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQR
...	...	@@ -27,28 +27,28 @@ pub extern fn __floatuntitf(arg: u128) f128 {
27	27	},
28	28	LDBL_MANT_DIG + 2 => {},
29	29	else => {
30		const shift_amt = @bitCast(i32, N +% (LDBL_MANT_DIG + 2)) -% sd;
	30	const shift_amt = @bitCast(i32, N + (LDBL_MANT_DIG + 2)) - sd;
31	31	const shift_amt_u7 = @intCast(u7, shift_amt);
32		a = (a >> @intCast(u7, sd -% (LDBL_MANT_DIG + 2))) \|
	32	a = (a >> @intCast(u7, sd - (LDBL_MANT_DIG + 2))) \|
33	33	@boolToInt((a & (u128(@maxValue(u128)) >> shift_amt_u7)) != 0);
34	34	},
35	35	}
36	36	// finish
37	37	a \|= @boolToInt((a & 4) != 0); // Or P into R
38		a +%= 1; // round - this step may add a significant bit
	38	a += 1; // round - this step may add a significant bit
39	39	a >>= 2; // dump Q and R
40	40	// a is now rounded to LDBL_MANT_DIG or LDBL_MANT_DIG+1 bits
41	41	if ((a & (u128(1) << LDBL_MANT_DIG)) != 0) {
42	42	a >>= 1;
43		e +%= 1;
	43	e += 1;
44	44	}
45	45	// a is now rounded to LDBL_MANT_DIG bits
46	46	} else {
47		a <<= @intCast(u7, LDBL_MANT_DIG -% sd);
	47	a <<= @intCast(u7, LDBL_MANT_DIG - sd);
48	48	// a is now rounded to LDBL_MANT_DIG bits
49	49	}
50	50
51		const high: u128 = (@intCast(u64, (e +% 16383)) << 48) \| // exponent
	51	const high: u128 = (@intCast(u64, (e + 16383)) << 48) \| // exponent
52	52	(@truncate(u64, a >> 64) & 0x0000ffffffffffff); // mantissa-high
53	53	const low = @truncate(u64, a); // mantissa-low
54	54