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util: add util_sign_extend

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This code is taken from src/freedreno/isa/decode.c.
Since we need a similar function in panfrost, it's probably good to move
it to utils.

Signed-off-by: Italo Nicola <italonicola@collabora.com>
Acked-by: Rob Clark <robclark@freedesktop.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9461>
This commit is contained in:
Italo Nicola
2021-04-19 09:43:30 +00:00
committed by Marge Bot
parent a854a9fa62
commit 8074a040e7
2 changed files with 17 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/freedreno/isa/decode.c
+3 -14
View File
@@ -479,17 +479,6 @@ isa_decode_field(struct decode_scope *scope, const char *field_name)
return val;
}
static int64_t
sign_extend(uint64_t val, unsigned width)
{
assert(width > 0);
if (val & (UINT64_C(1) << (width - 1))) {
return -(int64_t)((UINT64_C(1) << width) - val);
} else {
return val;
}
}
static void
display_field(struct decode_scope *scope, const char *field_name)
{
@@ -528,7 +517,7 @@ display_field(struct decode_scope *scope, const char *field_name)
/* Basic types: */
case TYPE_BRANCH:
if (scope->state->options->branch_labels) {
int offset = sign_extend(val, width) + scope->state->n;
int offset = util_sign_extend(val, width) + scope->state->n;
if (offset < scope->state->num_instr) {
fprintf(out, "l%d", offset);
BITSET_SET(scope->state->branch_targets, offset);
@@ -537,7 +526,7 @@ display_field(struct decode_scope *scope, const char *field_name)
}
FALLTHROUGH;
case TYPE_INT:
fprintf(out, "%"PRId64, sign_extend(val, width));
fprintf(out, "%"PRId64, util_sign_extend(val, width));
break;
case TYPE_UINT:
fprintf(out, "%"PRIu64, val);
@@ -548,7 +537,7 @@ display_field(struct decode_scope *scope, const char *field_name)
break;
case TYPE_OFFSET:
if (val != 0) {
fprintf(out, "%+"PRId64, sign_extend(val, width));
fprintf(out, "%+"PRId64, util_sign_extend(val, width));
}
break;
case TYPE_FLOAT:
src/util/u_math.h
+14
View File
@@ -642,6 +642,20 @@ util_bswap16(uint16_t n)
(n << 8);
}
/**
* Extend sign.
*/
static inline int64_t
util_sign_extend(uint64_t val, unsigned width)
{
assert(width > 0);
if (val & (UINT64_C(1) << (width - 1))) {
return -(int64_t)((UINT64_C(1) << width) - val);
} else {
return val;
}
}
static inline void*
util_memcpy_cpu_to_le32(void * restrict dest, const void * restrict src, size_t n)
{