diff options
| -rw-r--r-- | src/amd/common/ac_nir_to_llvm.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c index d6b450f8ee1..e12354980eb 100644 --- a/src/amd/common/ac_nir_to_llvm.c +++ b/src/amd/common/ac_nir_to_llvm.c @@ -1178,7 +1178,17 @@ static LLVMValueRef emit_find_lsb(struct ac_llvm_context *ctx, */ LLVMConstInt(ctx->i1, 1, false), }; - return ac_build_intrinsic(ctx, "llvm.cttz.i32", ctx->i32, params, 2, AC_FUNC_ATTR_READNONE); + + LLVMValueRef lsb = ac_build_intrinsic(ctx, "llvm.cttz.i32", ctx->i32, + params, 2, + AC_FUNC_ATTR_READNONE); + + /* TODO: We need an intrinsic to skip this conditional. */ + /* Check for zero: */ + return LLVMBuildSelect(ctx->builder, LLVMBuildICmp(ctx->builder, + LLVMIntEQ, src0, + ctx->i32_0, ""), + LLVMConstInt(ctx->i32, -1, 0), lsb, ""); } static LLVMValueRef emit_ifind_msb(struct ac_llvm_context *ctx, |