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gallivm: fix find lsb

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the GLSL return value is different than the llvm intrinsic.

Fixes arb gpu shader5 tests

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3528>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3528>
This commit is contained in:
Dave Airlie 2020-01-20 14:56:36 +10:00
parent 1e433c398e
commit 48ab21109c
1 changed files with 2 additions and 1 deletions
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src/gallium/auxiliary/gallivm/lp_bld_bitarit.c
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@ -276,7 +276,8 @@ lp_build_cttz(struct lp_build_context *bld, LLVMValueRef a)
LLVMValueRef undef_val = LLVMConstNull(LLVMInt1TypeInContext(bld->gallivm->context));
result = lp_build_intrinsic_binary(builder, intr_str, bld->vec_type, a, undef_val);
return result;
return LLVMBuildSelect(builder, LLVMBuildICmp(builder, LLVMIntEQ, a, bld->zero, ""),
lp_build_const_int_vec(bld->gallivm, bld->type, -1), result, "");
}
LLVMValueRef