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intel/compiler: implement is_zero, is_one, is_negative_one for 8-bit/16-bit 

There are no 8-bit immediates, so assert in that case.
16-bit immediates are replicated in each word of a 32-bit immediate, so
we only need to check the lower 16-bits.

v2:
 - Fix is_zero with half-float to consider -0 as well (Jason).
 - Fix is_negative_one for word type.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Iago Toral Quiroga 2018-10-26 13:40:27 +02:00 committed by Juan A. Suarez Romero
parent e64be391dd
commit 44e1affaec
1 changed files with 26 additions and 0 deletions
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26
src/intel/compiler/brw_shader.cpp
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@ -713,11 +713,20 @@ backend_reg::is_zero() const
if (file != IMM)
return false;
assert(type_sz(type) > 1);
switch (type) {
case BRW_REGISTER_TYPE_HF:
assert((d & 0xffff) == ((d >> 16) & 0xffff));
return (d & 0xffff) == 0 || (d & 0xffff) == 0x8000;
case BRW_REGISTER_TYPE_F:
return f == 0;
case BRW_REGISTER_TYPE_DF:
return df == 0;
case BRW_REGISTER_TYPE_W:
case BRW_REGISTER_TYPE_UW:
assert((d & 0xffff) == ((d >> 16) & 0xffff));
return (d & 0xffff) == 0;
case BRW_REGISTER_TYPE_D:
case BRW_REGISTER_TYPE_UD:
return d == 0;
@ -735,11 +744,20 @@ backend_reg::is_one() const
if (file != IMM)
return false;
assert(type_sz(type) > 1);
switch (type) {
case BRW_REGISTER_TYPE_HF:
assert((d & 0xffff) == ((d >> 16) & 0xffff));
return (d & 0xffff) == 0x3c00;
case BRW_REGISTER_TYPE_F:
return f == 1.0f;
case BRW_REGISTER_TYPE_DF:
return df == 1.0;
case BRW_REGISTER_TYPE_W:
case BRW_REGISTER_TYPE_UW:
assert((d & 0xffff) == ((d >> 16) & 0xffff));
return (d & 0xffff) == 1;
case BRW_REGISTER_TYPE_D:
case BRW_REGISTER_TYPE_UD:
return d == 1;
@ -757,11 +775,19 @@ backend_reg::is_negative_one() const
if (file != IMM)
return false;
assert(type_sz(type) > 1);
switch (type) {
case BRW_REGISTER_TYPE_HF:
assert((d & 0xffff) == ((d >> 16) & 0xffff));
return (d & 0xffff) == 0xbc00;
case BRW_REGISTER_TYPE_F:
return f == -1.0;
case BRW_REGISTER_TYPE_DF:
return df == -1.0;
case BRW_REGISTER_TYPE_W:
assert((d & 0xffff) == ((d >> 16) & 0xffff));
return (d & 0xffff) == 0xffff;
case BRW_REGISTER_TYPE_D:
return d == -1;
case BRW_REGISTER_TYPE_Q: