Mesa (master): gallivm: Increase lp_build_rsqrt() precision.

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: 47d6d44a231b811f1bba05478a6bbfb1e3fdb27b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=47d6d44a231b811f1bba05478a6bbfb1e3fdb27b

Author: José Fonseca <jfonseca at vmware.com>
Date:   Wed Jul 20 14:41:17 2011 -0700

gallivm: Increase lp_build_rsqrt() precision.

Add an iteration step, which makes rqsqrt precision go from 12bits to
24, and fixes RSQ/NRM test case of PSPrecision/VSPrevision DCTs.

There are no uses of this function outside shader translation.

---

 src/gallium/auxiliary/gallivm/lp_bld_arit.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.c b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
index 06e5deb..fce4685 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
@@ -1645,7 +1645,7 @@ lp_build_rsqrt(struct lp_build_context *bld,
    assert(type.floating);
 
    if (util_cpu_caps.has_sse && type.width == 32 && type.length == 4) {
-      const unsigned num_iterations = 0;
+      const unsigned num_iterations = 1;
       LLVMValueRef res;
       unsigned i;