Mesa (master): gallivm: fix typo in lp_build_mul_norm

[Roland Scheidegger]

Module: Mesa
Branch: master
Commit: 49f8825c49871ca956c7ed21b096f3835311f57e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=49f8825c49871ca956c7ed21b096f3835311f57e

Author: Roland Scheidegger <sroland at vmware.com>
Date:   Fri Feb  1 08:34:36 2013 -0800

gallivm: fix typo in lp_build_mul_norm

The signed case didn't do what the comment indicated. Should increase rounding
precision (at the expense of performance since the former code was effectively
a no-op).

Reviewed-by: Jose Fonseca <jfonseca at vmware.com>

---

 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 d930f09..b4e9f23 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
@@ -769,7 +769,7 @@ lp_build_mul_norm(struct gallivm_state *gallivm,
    half = lp_build_const_int_vec(gallivm, wide_type, 1 << (n - 1));
    if (wide_type.sign) {
       LLVMValueRef minus_half = LLVMBuildNeg(builder, half, "");
-      LLVMValueRef sign = lp_build_shr_imm(&bld, half, wide_type.width - 1);
+      LLVMValueRef sign = lp_build_shr_imm(&bld, ab, wide_type.width - 1);
       half = lp_build_select(&bld, sign, minus_half, half);
    }
    ab = LLVMBuildAdd(builder, ab, half, "");