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-rw-r--r--src/amd/common/ac_nir_to_llvm.c12
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 530b5817af3..19b1ef07155 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -1187,7 +1187,17 @@ 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,