nir/print: Print more representations in load_const
In addition to the hexadecimal and float (when applicable), print the
signed and unsigned representations. Representations may be omitted based
on information about the value:
- If gather types has unambiguous information, we use it;
- Float is omitted for 8 bit values;
- Signed decimal is omitted for positive values;
- Unsigned decimal is omitted for small values (representation is same as hex);
Note for now the "terse form" that appear in SSA uses is unchaged.
Based on a patch by Mike Blumenkrantz.
Examples:
```
// Just used as float. Omitted decimals.
vec4 32 ssa_81 = load_const (0x3f800000, 0x3f800000, 0x3e4ccccd, 0x3f800000) = (1.000000, 1.000000, 0.200000, 1.000000)
vec1 32 ssa_28 = load_const (0x3e4ccccd = 0.200000)
// Just a small integer. Omitted float and decimal.
vec1 32 ssa_45 = load_const (0x00000001)
// Larger positive integers. Omitted float.
vec1 32 ssa_39 = load_const (0x00002000 = 8192)
vec1 32 ssa_30 = load_const (0x000000ff = 255)
vec1 32 ssa_28 = load_const (0x00000010 = 16)
// Integers with negative values.
load_const (0xff = -1 = 255)
load_const (0xff80 = -128 = 65408)
load_const (0xffff = -1 = 65535)
// Same value, in the first case we know is used as an integer.
load_const (0xffffffe0 = -32 = 4294967264)
load_const (0xffffffe0 = -nan = -32 = 4294967264)
```
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Acked-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23562>
1 file changed
