From 44b3bfaa7599add72d76b3802ddea05b5b5c6316 Mon Sep 17 00:00:00 2001
From: Christoph Bumiller <e0425955@student.tuwien.ac.at>
Date: Sat, 23 May 2009 15:10:01 +0200
Subject: nv50: make sure half-long insns are paired

I chose to just convert unpaired 32 bit length instructions
after parsing all instructions, although it might be possible
to determine beforehand whether there would be any lone ones,
and then even do some swapping to bring them together ...
---
 src/gallium/drivers/nv50/nv50_program.c | 72 +++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/src/gallium/drivers/nv50/nv50_program.c b/src/gallium/drivers/nv50/nv50_program.c
index c420b8be1c3..78ffc7f7ce9 100644
--- a/src/gallium/drivers/nv50/nv50_program.c
+++ b/src/gallium/drivers/nv50/nv50_program.c
@@ -945,6 +945,54 @@ emit_kil(struct nv50_pc *pc, struct nv50_reg *src)
 	emit(pc, e);
 }
 
+static void
+convert_to_long(struct nv50_pc *pc, struct nv50_program_exec *e)
+{
+	unsigned q = 0, m = ~0;
+
+	assert(!is_long(e));
+
+	switch (e->inst[0] >> 28) {
+	case 0x1:
+		/* MOV */
+		q = 0x0403c000;
+		m = 0xffff7fff;
+		break;
+	case 0x8:
+		/* INTERP */
+		m = ~0x02000000;
+		if (e->inst[0] & 0x02000000)
+			q = 0x00020000;
+		break;
+	case 0x9:
+		/* RCP */
+		break;
+	case 0xB:
+		/* ADD */
+		m = ~(127 << 16);
+		q = ((e->inst[0] & (~m)) >> 2);
+		break;
+	case 0xC:
+		/* MUL */
+		m = ~0x00008000;
+		q = ((e->inst[0] & (~m)) << 12);
+		break;
+	case 0xE:
+		/* MAD (if src2 == dst) */
+		q = ((e->inst[0] & 0x1fc) << 12);
+		break;
+	default:
+		assert(0);
+		break;
+	}
+
+	set_long(pc, e);
+	pc->p->exec_size++;
+
+	e->inst[0] &= m;
+	e->inst[1] |= q;
+}
+
 static struct nv50_reg *
 tgsi_dst(struct nv50_pc *pc, int c, const struct tgsi_full_dst_register *dst)
 {
@@ -1971,6 +2019,30 @@ nv50_program_tx(struct nv50_program *p)
 		}
 	}
 
+	/* look for single half instructions and make them long */
+	struct nv50_program_exec *e, *e_prev;
+
+	for (k = 0, e = pc->p->exec_head, e_prev = NULL; e; e = e->next) {
+		if (!is_long(e))
+			k++;
+
+		if (!e->next || is_long(e->next)) {
+			if (k & 1)
+				convert_to_long(pc, e);
+			k = 0;
+		}
+
+		if (e->next)
+			e_prev = e;
+	}
+
+	if (!is_long(pc->p->exec_tail)) {
+		/* this may occur if moving FP results */
+		assert(e_prev && !is_long(e_prev));
+		convert_to_long(pc, e_prev);
+		convert_to_long(pc, pc->p->exec_tail);
+	}
+
 	assert(is_long(pc->p->exec_tail) && !is_immd(pc->p->exec_head));
 	pc->p->exec_tail->inst[1] |= 0x00000001;
 
-- 
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