From 4f2290d1612569686284609059d29a85c9de67cf Mon Sep 17 00:00:00 2001 From: Oded Gabbay Date: Thu, 3 Sep 2015 19:00:26 +0300 Subject: llvmpipe: convert double to long long instead of unsigned long long 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 CC: "10.6 11.0" Reviewed-by: Tom Stellard Reviewed-by: Roland Scheidegger --- src/gallium/auxiliary/gallivm/lp_bld_const.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/gallium/auxiliary') 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; -- cgit v1.1