[Mesa-dev] [PATCH v2] llvmpipe: convert double to long long instead of unsigned long long

[Oded Gabbay]

round(val*dscale) produces a double result, as val and dscale are double.
However, LLVMConstInt receives unsigned long long, so there is an
implicit conversion from double to unsigned long long.
This is an undefined behavior. Therefore, we need to first explicitly
convert the round result to long long, and then let the compiler handle
conversion from that to unsigned long long.

This bug manifests itself in POWER, where all IMM values of -1 are being
converted to 0 implicitly, causing a wrong LLVM IR output.

Signed-off-by: Oded Gabbay <oded.gabbay at gmail.com>
CC: "10.6 11.0" <mesa-stable at lists.freedesktop.org>
Reviewed-by: Tom Stellard <thomas.stellard at amd.com>
---
 src/gallium/auxiliary/gallivm/lp_bld_const.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_const.c b/src/gallium/auxiliary/gallivm/lp_bld_const.c
index 0f5a8f8..9cd7c55 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_const.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_const.c
@@ -311,7 +311,7 @@ lp_build_const_elem(struct gallivm_state *gallivm,
    else {
       double dscale = lp_const_scale(type);
 
-      elem = LLVMConstInt(elem_type, round(val*dscale), 0);
+      elem = LLVMConstInt(elem_type, (long long) round(val*dscale), 0);
    }
 
    return elem;
-- 
2.4.3