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vc4: Make integer multiply use 24 bits for the low parts.

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The hardware uses the low 24 bits in integer multiplies, so we can have
fewer high bits (and so probably drop them more frequently).
This commit is contained in:
Eric Anholt 2015-03-29 21:21:10 -07:00
parent 18004c338f
commit 5df8bf86fe
1 changed files with 5 additions and 5 deletions
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10
src/gallium/drivers/vc4/vc4_program.c
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@ -367,13 +367,13 @@ tgsi_to_qir_umul(struct vc4_compile *c,
enum qop op, struct qreg *src, int i)
{
struct qreg src0_hi = qir_SHR(c, src[0 * 4 + i],
qir_uniform_ui(c, 16));
qir_uniform_ui(c, 24));
struct qreg src0_lo = qir_AND(c, src[0 * 4 + i],
qir_uniform_ui(c, 0xffff));
qir_uniform_ui(c, 0xffffff));
struct qreg src1_hi = qir_SHR(c, src[1 * 4 + i],
qir_uniform_ui(c, 16));
qir_uniform_ui(c, 24));
struct qreg src1_lo = qir_AND(c, src[1 * 4 + i],
qir_uniform_ui(c, 0xffff));
qir_uniform_ui(c, 0xffffff));
struct qreg hilo = qir_MUL24(c, src0_hi, src1_lo);
struct qreg lohi = qir_MUL24(c, src0_lo, src1_hi);
@ -381,7 +381,7 @@ tgsi_to_qir_umul(struct vc4_compile *c,
return qir_ADD(c, lolo, qir_SHL(c,
qir_ADD(c, hilo, lohi),
qir_uniform_ui(c, 16)));
qir_uniform_ui(c, 24)));
}
static struct qreg